diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index cb0a0d3fe..c46e6b897 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -8,6 +8,38 @@
       <option name="DO_NOT_WRAP_AFTER_SINGLE_ANNOTATION" value="true" />
       <option name="ALIGN_MULTILINE_ANNOTATION_PARAMETERS" value="true" />
       <option name="ALIGN_MULTILINE_TEXT_BLOCKS" value="true" />
+      <option name="IMPORT_LAYOUT_TABLE">
+        <value>
+          <package name="android" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="androidx" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="com" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="junit" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="net" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="org" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="java" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="javax" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="" withSubpackages="true" static="false" />
+          <emptyLine />
+          <package name="android" withSubpackages="true" static="true" />
+          <package name="androidx" withSubpackages="true" static="true" />
+          <package name="com" withSubpackages="true" static="true" />
+          <package name="junit" withSubpackages="true" static="true" />
+          <package name="net" withSubpackages="true" static="true" />
+          <package name="org" withSubpackages="true" static="true" />
+          <package name="java" withSubpackages="true" static="true" />
+          <package name="javax" withSubpackages="true" static="true" />
+          <package name="" withSubpackages="true" static="true" />
+          <emptyLine />
+        </value>
+      </option>
     </JavaCodeStyleSettings>
     <JetCodeStyleSettings>
       <option name="PACKAGES_TO_USE_STAR_IMPORTS">
diff --git a/app/src/main/java/org/thoughtcrime/securesms/AppCapabilities.java b/app/src/main/java/org/thoughtcrime/securesms/AppCapabilities.java
index c23b855cf..cf78973be 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/AppCapabilities.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/AppCapabilities.java
@@ -12,12 +12,13 @@ public final class AppCapabilities {
   private static final boolean GV1_MIGRATION       = true;
   private static final boolean ANNOUNCEMENT_GROUPS = true;
   private static final boolean SENDER_KEY          = true;
+  private static final boolean CHANGE_NUMBER       = true;
 
   /**
    * @param storageCapable Whether or not the user can use storage service. This is another way of
    *                       asking if the user has set a Signal PIN or not.
    */
   public static AccountAttributes.Capabilities getCapabilities(boolean storageCapable) {
-    return new AccountAttributes.Capabilities(UUID_CAPABLE, GV2_CAPABLE, storageCapable, GV1_MIGRATION, SENDER_KEY, ANNOUNCEMENT_GROUPS);
+    return new AccountAttributes.Capabilities(UUID_CAPABLE, GV2_CAPABLE, storageCapable, GV1_MIGRATION, SENDER_KEY, ANNOUNCEMENT_GROUPS, CHANGE_NUMBER);
   }
 }
diff --git a/app/src/main/java/org/thoughtcrime/securesms/BindableConversationItem.java b/app/src/main/java/org/thoughtcrime/securesms/BindableConversationItem.java
index 59b3cbd17..5ce5c952c 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/BindableConversationItem.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/BindableConversationItem.java
@@ -87,6 +87,7 @@ public interface BindableConversationItem extends Unbindable, GiphyMp4Playable,
     void onPlayInlineContent(ConversationMessage conversationMessage);
     void onInMemoryMessageClicked(@NonNull InMemoryMessageRecord messageRecord);
     void onViewGroupDescriptionChange(@Nullable GroupId groupId, @NonNull String description, boolean isMessageRequestAccepted);
+    void onChangeNumberUpdateContact(@NonNull Recipient recipient);
 
     /** @return true if handled, false if you want to let the normal url handling continue */
     boolean onUrlClicked(@NonNull String url);
diff --git a/app/src/main/java/org/thoughtcrime/securesms/components/settings/app/account/AccountSettingsFragment.kt b/app/src/main/java/org/thoughtcrime/securesms/components/settings/app/account/AccountSettingsFragment.kt
index 9b8a633dc..c7cfa277f 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/components/settings/app/account/AccountSettingsFragment.kt
+++ b/app/src/main/java/org/thoughtcrime/securesms/components/settings/app/account/AccountSettingsFragment.kt
@@ -30,6 +30,7 @@ import org.thoughtcrime.securesms.lock.v2.CreateKbsPinActivity
 import org.thoughtcrime.securesms.lock.v2.KbsConstants
 import org.thoughtcrime.securesms.lock.v2.PinKeyboardType
 import org.thoughtcrime.securesms.pin.RegistrationLockV2Dialog
+import org.thoughtcrime.securesms.recipients.Recipient
 import org.thoughtcrime.securesms.util.FeatureFlags
 import org.thoughtcrime.securesms.util.ServiceUtil
 import org.thoughtcrime.securesms.util.ThemeUtil
@@ -104,7 +105,7 @@ class AccountSettingsFragment : DSLSettingsFragment(R.string.AccountSettingsFrag
 
       sectionHeaderPref(R.string.AccountSettingsFragment__account)
 
-      if (FeatureFlags.changeNumber()) {
+      if (FeatureFlags.changeNumber() && Recipient.self().changeNumberCapability == Recipient.Capability.SUPPORTED) {
         clickPref(
           title = DSLSettingsText.from(R.string.AccountSettingsFragment__change_phone_number),
           onClick = {
diff --git a/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java b/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java
index 485bd9f35..446e1fbe7 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java
@@ -86,7 +86,6 @@ import org.thoughtcrime.securesms.contactshare.ContactUtil;
 import org.thoughtcrime.securesms.contactshare.SharedContactDetailsActivity;
 import org.thoughtcrime.securesms.conversation.ConversationAdapter.ItemClickListener;
 import org.thoughtcrime.securesms.conversation.ConversationAdapter.StickyHeaderViewHolder;
-import org.thoughtcrime.securesms.conversation.ConversationMessage.ConversationMessageFactory;
 import org.thoughtcrime.securesms.conversation.colors.Colorizer;
 import org.thoughtcrime.securesms.conversation.colors.ColorizerView;
 import org.thoughtcrime.securesms.conversation.mutiselect.MultiselectItemAnimator;
@@ -136,6 +135,7 @@ import org.thoughtcrime.securesms.ratelimit.RecaptchaProofBottomSheetFragment;
 import org.thoughtcrime.securesms.reactions.ReactionsBottomSheetDialogFragment;
 import org.thoughtcrime.securesms.recipients.LiveRecipient;
 import org.thoughtcrime.securesms.recipients.Recipient;
+import org.thoughtcrime.securesms.recipients.RecipientExporter;
 import org.thoughtcrime.securesms.recipients.RecipientId;
 import org.thoughtcrime.securesms.recipients.ui.bottomsheet.RecipientBottomSheetDialogFragment;
 import org.thoughtcrime.securesms.revealable.ViewOnceMessageActivity;
@@ -1718,6 +1718,11 @@ public class ConversationFragment extends LoggingFragment implements Multiselect
         GroupDescriptionDialog.show(getChildFragmentManager(), groupId, description, isMessageRequestAccepted);
       }
     }
+
+    @Override
+    public void onChangeNumberUpdateContact(@NonNull Recipient recipient) {
+      startActivity(RecipientExporter.export(recipient).asAddContactIntent());
+    }
   }
 
   public void refreshList() {
diff --git a/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationUpdateItem.java b/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationUpdateItem.java
index 82b05f952..1f860b4e3 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationUpdateItem.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationUpdateItem.java
@@ -408,6 +408,14 @@ public final class ConversationUpdateItem extends FrameLayout
           eventListener.onBadDecryptLearnMoreClicked(conversationMessage.getMessageRecord().getRecipient().getId());
         }
       });
+    } else if (conversationMessage.getMessageRecord().isChangeNumber() && conversationMessage.getMessageRecord().getIndividualRecipient().isSystemContact()) {
+      actionButton.setText(R.string.ConversationUpdateItem_update_contact);
+      actionButton.setVisibility(VISIBLE);
+      actionButton.setOnClickListener(v -> {
+        if (batchSelected.isEmpty() && eventListener != null) {
+          eventListener.onChangeNumberUpdateContact(conversationMessage.getMessageRecord().getIndividualRecipient());
+        }
+      });
     } else {
       actionButton.setVisibility(GONE);
       actionButton.setOnClickListener(null);
@@ -480,10 +488,11 @@ public final class ConversationUpdateItem extends FrameLayout
   }
 
   private static boolean isSameType(@NonNull MessageRecord current, @NonNull MessageRecord candidate) {
-    return (current.isGroupUpdate()           && candidate.isGroupUpdate())   ||
-           (current.isProfileChange()         && candidate.isProfileChange()) ||
-           (current.isGroupCall()             && candidate.isGroupCall())     ||
-           (current.isExpirationTimerUpdate() && candidate.isExpirationTimerUpdate());
+    return (current.isGroupUpdate()           && candidate.isGroupUpdate())           ||
+           (current.isProfileChange()         && candidate.isProfileChange())         ||
+           (current.isGroupCall()             && candidate.isGroupCall())             ||
+           (current.isExpirationTimerUpdate() && candidate.isExpirationTimerUpdate()) ||
+           (current.isChangeNumber()          && candidate.isChangeNumber());
   }
 
   @Override
diff --git a/app/src/main/java/org/thoughtcrime/securesms/conversation/MenuState.java b/app/src/main/java/org/thoughtcrime/securesms/conversation/MenuState.java
index 49fbb2f11..f50e1d568 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/conversation/MenuState.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/conversation/MenuState.java
@@ -7,7 +7,6 @@ import org.thoughtcrime.securesms.database.model.MediaMmsMessageRecord;
 import org.thoughtcrime.securesms.database.model.MessageRecord;
 import org.thoughtcrime.securesms.database.model.MmsMessageRecord;
 import org.thoughtcrime.securesms.recipients.Recipient;
-import org.thoughtcrime.securesms.util.FeatureFlags;
 
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -188,7 +187,8 @@ final class MenuState {
            messageRecord.isProfileChange() ||
            messageRecord.isGroupV1MigrationEvent() ||
            messageRecord.isChatSessionRefresh() ||
-           messageRecord.isInMemoryMessageRecord();
+           messageRecord.isInMemoryMessageRecord() ||
+           messageRecord.isChangeNumber();
   }
 
   private final static class Builder {
diff --git a/app/src/main/java/org/thoughtcrime/securesms/conversationlist/ConversationListItem.java b/app/src/main/java/org/thoughtcrime/securesms/conversationlist/ConversationListItem.java
index e7f0fc9cf..16b830486 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/conversationlist/ConversationListItem.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/conversationlist/ConversationListItem.java
@@ -491,6 +491,8 @@ public final class ConversationListItem extends ConstraintLayout
       return emphasisAdded(context, context.getString(R.string.ThreadRecord_message_could_not_be_processed), defaultTint);
     } else if (SmsDatabase.Types.isProfileChange(thread.getType())) {
       return emphasisAdded(context, "", defaultTint);
+    } else if (SmsDatabase.Types.isChangeNumber(thread.getType())) {
+      return emphasisAdded(context, "", defaultTint);
     } else if (MmsSmsColumns.Types.isBadDecryptType(thread.getType())) {
       return emphasisAdded(context, context.getString(R.string.ThreadRecord_delivery_issue), defaultTint);
     } else {
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/MessageDatabase.java b/app/src/main/java/org/thoughtcrime/securesms/database/MessageDatabase.java
index 05a551818..b58d0eb7a 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/MessageDatabase.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/MessageDatabase.java
@@ -167,6 +167,7 @@ public abstract class MessageDatabase extends Database implements MmsSmsColumns
   public abstract long insertMessageOutbox(@NonNull OutgoingMediaMessage message, long threadId, boolean forceSms, int defaultReceiptStatus, @Nullable SmsDatabase.InsertListener insertListener) throws MmsException;
   public abstract void insertProfileNameChangeMessages(@NonNull Recipient recipient, @NonNull String newProfileName, @NonNull String previousProfileName);
   public abstract void insertGroupV1MigrationEvents(@NonNull RecipientId recipientId, long threadId, @NonNull GroupMigrationMembershipChange membershipChange);
+  public abstract void insertNumberChangeMessages(@NonNull Recipient recipient);
 
   public abstract boolean deleteMessage(long messageId);
   abstract void deleteThread(long threadId);
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/MmsDatabase.java b/app/src/main/java/org/thoughtcrime/securesms/database/MmsDatabase.java
index f5f700c73..e57b859d0 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/MmsDatabase.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/MmsDatabase.java
@@ -503,6 +503,11 @@ public class MmsDatabase extends MessageDatabase {
     throw new UnsupportedOperationException();
   }
 
+  @Override
+  public void insertNumberChangeMessages(@NonNull Recipient recipient) {
+    throw new UnsupportedOperationException();
+  }
+
   @Override
   public void endTransaction(SQLiteDatabase database) {
     database.endTransaction();
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsColumns.java b/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsColumns.java
index 079796fcc..a5343da4a 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsColumns.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsColumns.java
@@ -77,6 +77,7 @@ public interface MmsSmsColumns {
     protected static final long OUTGOING_VIDEO_CALL_TYPE           = 11;
     protected static final long GROUP_CALL_TYPE                    = 12;
     protected static final long BAD_DECRYPT_TYPE                   = 13;
+    protected static final long CHANGE_NUMBER_TYPE                 = 14;
 
     protected static final long BASE_INBOX_TYPE                    = 20;
     protected static final long BASE_OUTBOX_TYPE                   = 21;
@@ -334,6 +335,10 @@ public interface MmsSmsColumns {
       return type == GV1_MIGRATION_TYPE;
     }
 
+    public static boolean isChangeNumber(long type) {
+      return type == CHANGE_NUMBER_TYPE;
+    }
+
     public static long translateFromSystemBaseType(long theirType) {
 //    public static final int NONE_TYPE           = 0;
 //    public static final int INBOX_TYPE          = 1;
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsDatabase.java b/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsDatabase.java
index d8982c649..f8103c531 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsDatabase.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/MmsSmsDatabase.java
@@ -108,7 +108,7 @@ public class MmsSmsDatabase extends Database {
                                               MmsSmsColumns.RECEIPT_TIMESTAMP};
 
   private static final String SNIPPET_QUERY = "SELECT " + MmsSmsColumns.ID + ", 0 AS " + TRANSPORT + ", " + SmsDatabase.TYPE +        " AS " + MmsSmsColumns.NORMALIZED_TYPE + ", " + SmsDatabase.DATE_RECEIVED + " AS " + MmsSmsColumns.NORMALIZED_DATE_RECEIVED + " FROM " + SmsDatabase.TABLE_NAME + " " +
-                                              "WHERE " + MmsSmsColumns.THREAD_ID + " = ? AND " + SmsDatabase.TYPE + " NOT IN (" + SmsDatabase.Types.PROFILE_CHANGE_TYPE + ", " + SmsDatabase.Types.GV1_MIGRATION_TYPE + ") " +
+                                              "WHERE " + MmsSmsColumns.THREAD_ID + " = ? AND " + SmsDatabase.TYPE + " NOT IN (" + SmsDatabase.Types.PROFILE_CHANGE_TYPE + ", " + SmsDatabase.Types.GV1_MIGRATION_TYPE + ", " + SmsDatabase.Types.CHANGE_NUMBER_TYPE + ") " +
                                               "UNION ALL " +
                                               "SELECT " + MmsSmsColumns.ID + ", 1 AS " + TRANSPORT + ", " + MmsDatabase.MESSAGE_BOX + " AS " + MmsSmsColumns.NORMALIZED_TYPE + ", " + MmsDatabase.DATE_RECEIVED + " AS " + MmsSmsColumns.NORMALIZED_DATE_RECEIVED + " FROM " + MmsDatabase.TABLE_NAME + " " +
                                               "WHERE " + MmsSmsColumns.THREAD_ID + " = ? " +
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/RecipientDatabase.java b/app/src/main/java/org/thoughtcrime/securesms/database/RecipientDatabase.java
index 377252ffc..8341a7307 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/RecipientDatabase.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/RecipientDatabase.java
@@ -29,9 +29,9 @@ import org.thoughtcrime.securesms.conversation.colors.ChatColors;
 import org.thoughtcrime.securesms.conversation.colors.ChatColorsMapper;
 import org.thoughtcrime.securesms.crypto.ProfileKeyUtil;
 import org.thoughtcrime.securesms.crypto.storage.TextSecureIdentityKeyStore;
-import org.thoughtcrime.securesms.database.model.IdentityRecord;
 import org.thoughtcrime.securesms.database.IdentityDatabase.VerifiedStatus;
 import org.thoughtcrime.securesms.database.helpers.SQLCipherOpenHelper;
+import org.thoughtcrime.securesms.database.model.IdentityRecord;
 import org.thoughtcrime.securesms.database.model.ThreadRecord;
 import org.thoughtcrime.securesms.database.model.databaseprotos.ChatColor;
 import org.thoughtcrime.securesms.database.model.databaseprotos.DeviceLastResetTime;
@@ -42,6 +42,7 @@ import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.groups.GroupId;
 import org.thoughtcrime.securesms.groups.v2.ProfileKeySet;
 import org.thoughtcrime.securesms.groups.v2.processing.GroupsV2StateProcessor;
+import org.thoughtcrime.securesms.jobs.RecipientChangedNumberJob;
 import org.thoughtcrime.securesms.jobs.RefreshAttributesJob;
 import org.thoughtcrime.securesms.jobs.RequestGroupV2InfoJob;
 import org.thoughtcrime.securesms.jobs.RetrieveProfileJob;
@@ -59,6 +60,7 @@ import org.thoughtcrime.securesms.util.GroupUtil;
 import org.thoughtcrime.securesms.util.IdentityUtil;
 import org.thoughtcrime.securesms.util.SqlUtil;
 import org.thoughtcrime.securesms.util.StringUtil;
+import org.thoughtcrime.securesms.util.TextSecurePreferences;
 import org.thoughtcrime.securesms.util.Util;
 import org.thoughtcrime.securesms.wallpaper.ChatWallpaper;
 import org.thoughtcrime.securesms.wallpaper.ChatWallpaperFactory;
@@ -167,6 +169,7 @@ public class RecipientDatabase extends Database {
     static final int GROUPS_V1_MIGRATION = 1;
     static final int SENDER_KEY          = 2;
     static final int ANNOUNCEMENT_GROUPS = 3;
+    static final int CHANGE_NUMBER       = 4;
   }
 
   private static final String[] RECIPIENT_PROJECTION = new String[] {
@@ -421,12 +424,17 @@ public class RecipientDatabase extends Database {
   }
 
   public @NonNull RecipientId getAndPossiblyMerge(@Nullable UUID uuid, @Nullable String e164, boolean highTrust) {
+    return getAndPossiblyMerge(uuid, e164, highTrust, false);
+  }
+
+  public @NonNull RecipientId getAndPossiblyMerge(@Nullable UUID uuid, @Nullable String e164, boolean highTrust, boolean changeSelf) {
     if (uuid == null && e164 == null) {
       throw new IllegalArgumentException("Must provide a UUID or E164!");
     }
 
     RecipientId                    recipientNeedingRefresh = null;
     Pair<RecipientId, RecipientId> remapped                = null;
+    RecipientId                    recipientChangedNumber  = null;
     boolean                        transactionSuccessful   = false;
 
     SQLiteDatabase db = databaseHelper.getSignalWritableDatabase();
@@ -485,9 +493,15 @@ public class RecipientDatabase extends Database {
       } else if (!byE164.isPresent() && byUuid.isPresent()) {
         if (e164 != null) {
           if (highTrust) {
-            Log.i(TAG, String.format(Locale.US, "Found out about an E164 (%s) for a known UUID user (%s). High-trust, so updating.", e164, byUuid.get()), true);
-            setPhoneNumberOrThrow(byUuid.get(), e164);
-            finalId = byUuid.get();
+            if (Objects.equals(uuid, TextSecurePreferences.getLocalUuid(context)) && !changeSelf) {
+              Log.w(TAG, String.format(Locale.US, "Found out about an E164 (%s) for our own UUID user (%s). High-trust but not change self, doing nothing.", e164, byUuid.get()), true);
+              finalId = byUuid.get();
+            } else {
+              Log.i(TAG, String.format(Locale.US, "Found out about an E164 (%s) for a known UUID user (%s). High-trust, so updating.", e164, byUuid.get()), true);
+              setPhoneNumberOrThrow(byUuid.get(), e164);
+              finalId = byUuid.get();
+              recipientChangedNumber = finalId;
+            }
           } else {
             Log.i(TAG, String.format(Locale.US, "Found out about an E164 (%s) for a known UUID user (%s). Low-trust, so doing nothing.", e164, byUuid.get()), true);
             finalId = byUuid.get();
@@ -552,6 +566,10 @@ public class RecipientDatabase extends Database {
           StorageSyncHelper.scheduleSyncForDataChange();
           RecipientId.clearCache();
         }
+
+        if (recipientChangedNumber != null) {
+          ApplicationDependencies.getJobManager().add(new RecipientChangedNumberJob(recipientChangedNumber));
+        }
       }
     }
   }
@@ -1616,6 +1634,7 @@ public class RecipientDatabase extends Database {
     value = Bitmask.update(value, Capabilities.GROUPS_V1_MIGRATION, Capabilities.BIT_LENGTH, Recipient.Capability.fromBoolean(capabilities.isGv1Migration()).serialize());
     value = Bitmask.update(value, Capabilities.SENDER_KEY,          Capabilities.BIT_LENGTH, Recipient.Capability.fromBoolean(capabilities.isSenderKey()).serialize());
     value = Bitmask.update(value, Capabilities.ANNOUNCEMENT_GROUPS, Capabilities.BIT_LENGTH, Recipient.Capability.fromBoolean(capabilities.isAnnouncementGroup()).serialize());
+    value = Bitmask.update(value, Capabilities.CHANGE_NUMBER,       Capabilities.BIT_LENGTH, Recipient.Capability.fromBoolean(capabilities.isChangeNumber()).serialize());
 
     ContentValues values = new ContentValues(1);
     values.put(CAPABILITIES, value);
@@ -2040,7 +2059,7 @@ public class RecipientDatabase extends Database {
 
     try {
       RecipientId id    = Recipient.self().getId();
-      RecipientId newId = getAndPossiblyMerge(Recipient.self().requireUuid(), e164, true);
+      RecipientId newId = getAndPossiblyMerge(Recipient.self().requireUuid(), e164, true, true);
 
       if (id.equals(newId)) {
         Log.i(TAG, "[updateSelfPhone] Phone updated for self");
@@ -3159,6 +3178,7 @@ public class RecipientDatabase extends Database {
     private final Recipient.Capability            groupsV1MigrationCapability;
     private final Recipient.Capability            senderKeyCapability;
     private final Recipient.Capability            announcementGroupCapability;
+    private final Recipient.Capability            changeNumberCapability;
     private final InsightsBannerTier              insightsBannerTier;
     private final byte[]                          storageId;
     private final MentionSetting                  mentionSetting;
@@ -3251,6 +3271,7 @@ public class RecipientDatabase extends Database {
       this.groupsV1MigrationCapability = Recipient.Capability.deserialize((int) Bitmask.read(capabilities, Capabilities.GROUPS_V1_MIGRATION, Capabilities.BIT_LENGTH));
       this.senderKeyCapability         = Recipient.Capability.deserialize((int) Bitmask.read(capabilities, Capabilities.SENDER_KEY, Capabilities.BIT_LENGTH));
       this.announcementGroupCapability = Recipient.Capability.deserialize((int) Bitmask.read(capabilities, Capabilities.ANNOUNCEMENT_GROUPS, Capabilities.BIT_LENGTH));
+      this.changeNumberCapability      = Recipient.Capability.deserialize((int) Bitmask.read(capabilities, Capabilities.CHANGE_NUMBER, Capabilities.BIT_LENGTH));
       this.insightsBannerTier          = insightsBannerTier;
       this.storageId                   = storageId;
       this.mentionSetting              = mentionSetting;
@@ -3408,6 +3429,10 @@ public class RecipientDatabase extends Database {
       return announcementGroupCapability;
     }
 
+    public @NonNull Recipient.Capability getChangeNumberCapability() {
+      return changeNumberCapability;
+    }
+
     public @Nullable byte[] getStorageId() {
       return storageId;
     }
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/SmsDatabase.java b/app/src/main/java/org/thoughtcrime/securesms/database/SmsDatabase.java
index c16dfd73e..c22eba806 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/SmsDatabase.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/SmsDatabase.java
@@ -73,6 +73,7 @@ import java.util.HashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Set;
 import java.util.UUID;
 
@@ -270,8 +271,8 @@ public class SmsDatabase extends MessageDatabase {
   }
 
   private @NonNull SqlUtil.Query buildMeaningfulMessagesQuery(long threadId) {
-    String query = THREAD_ID + " = ? AND (NOT " + TYPE + " & ? AND TYPE != ?)";
-    return SqlUtil.buildQuery(query, threadId, IGNORABLE_TYPESMASK_WHEN_COUNTING, Types.PROFILE_CHANGE_TYPE);
+    String query = THREAD_ID + " = ? AND (NOT " + TYPE + " & ? AND TYPE != ? AND TYPE != ?)";
+    return SqlUtil.buildQuery(query, threadId, IGNORABLE_TYPESMASK_WHEN_COUNTING, Types.PROFILE_CHANGE_TYPE, Types.CHANGE_NUMBER_TYPE);
   }
 
   @Override
@@ -1027,6 +1028,53 @@ public class SmsDatabase extends MessageDatabase {
     databaseHelper.getSignalWritableDatabase().insert(TABLE_NAME, null, values);
   }
 
+  @Override
+  public void insertNumberChangeMessages(@NonNull Recipient recipient) {
+    ThreadDatabase                  threadDatabase    = DatabaseFactory.getThreadDatabase(context);
+    List<GroupDatabase.GroupRecord> groupRecords      = DatabaseFactory.getGroupDatabase(context).getGroupsContainingMember(recipient.getId(), false);
+    List<Long>                      threadIdsToUpdate = new LinkedList<>();
+
+    SQLiteDatabase db = databaseHelper.getSignalWritableDatabase();
+    db.beginTransaction();
+
+    try {
+      threadIdsToUpdate.add(threadDatabase.getThreadIdFor(recipient.getId()));
+      for (GroupDatabase.GroupRecord groupRecord : groupRecords) {
+        if (groupRecord.isActive()) {
+          threadIdsToUpdate.add(threadDatabase.getThreadIdFor(groupRecord.getRecipientId()));
+        }
+      }
+
+      threadIdsToUpdate.stream()
+                       .filter(Objects::nonNull)
+                       .forEach(threadId -> {
+                         ContentValues values = new ContentValues();
+                         values.put(RECIPIENT_ID, recipient.getId().serialize());
+                         values.put(ADDRESS_DEVICE_ID, 1);
+                         values.put(DATE_RECEIVED, System.currentTimeMillis());
+                         values.put(DATE_SENT, System.currentTimeMillis());
+                         values.put(READ, 1);
+                         values.put(TYPE, Types.CHANGE_NUMBER_TYPE);
+                         values.put(THREAD_ID, threadId);
+                         values.putNull(BODY);
+
+                         db.insert(TABLE_NAME, null, values);
+                       });
+
+      db.setTransactionSuccessful();
+    } finally {
+      db.endTransaction();
+    }
+
+    threadIdsToUpdate.stream()
+                     .filter(Objects::nonNull)
+                     .forEach(threadId -> {
+                       TrimThreadJob.enqueueAsync(threadId);
+                       DatabaseFactory.getThreadDatabase(context).update(threadId, true);
+                       notifyConversationListeners(threadId);
+                     });
+  }
+
   @Override
   public Optional<InsertResult> insertMessageInbox(IncomingTextMessage message, long type) {
     if (message.isJoined()) {
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/ThreadDatabase.java b/app/src/main/java/org/thoughtcrime/securesms/database/ThreadDatabase.java
index d4edd296b..4f3eb244c 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/ThreadDatabase.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/ThreadDatabase.java
@@ -1514,7 +1514,8 @@ public class ThreadDatabase extends Database {
 
   private boolean isSilentType(long type) {
     return MmsSmsColumns.Types.isProfileChange(type) ||
-           MmsSmsColumns.Types.isGroupV1MigrationEvent(type);
+           MmsSmsColumns.Types.isGroupV1MigrationEvent(type) ||
+           MmsSmsColumns.Types.isChangeNumber(type);
   }
 
   public Reader readerFor(Cursor cursor) {
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/model/DisplayRecord.java b/app/src/main/java/org/thoughtcrime/securesms/database/model/DisplayRecord.java
index f578309ec..af9311273 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/model/DisplayRecord.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/model/DisplayRecord.java
@@ -178,6 +178,10 @@ public abstract class DisplayRecord {
     return SmsDatabase.Types.isProfileChange(type);
   }
 
+  public boolean isChangeNumber() {
+    return SmsDatabase.Types.isChangeNumber(type);
+  }
+
   public int getDeliveryStatus() {
     return deliveryStatus;
   }
diff --git a/app/src/main/java/org/thoughtcrime/securesms/database/model/MessageRecord.java b/app/src/main/java/org/thoughtcrime/securesms/database/model/MessageRecord.java
index 544b1475f..e6f62c6bb 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/database/model/MessageRecord.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/database/model/MessageRecord.java
@@ -187,6 +187,8 @@ public abstract class MessageRecord extends DisplayRecord {
       else              return fromRecipient(getIndividualRecipient(), r -> context.getString(R.string.MessageRecord_you_marked_your_safety_number_with_s_unverified_from_another_device, r.getDisplayName(context)), R.drawable.ic_update_info_16);
     } else if (isProfileChange()) {
       return staticUpdateDescription(getProfileChangeDescription(context), R.drawable.ic_update_profile_16);
+    } else if (isChangeNumber()) {
+      return fromRecipient(getIndividualRecipient(), r -> context.getString(R.string.MessageRecord_s_changed_their_number_to_a_new_number, r.getDisplayName(context)), R.drawable.ic_phone_16);
     } else if (isEndSession()) {
       if (isOutgoing()) return staticUpdateDescription(context.getString(R.string.SmsMessageRecord_secure_session_reset), R.drawable.ic_update_info_16);
       else              return fromRecipient(getIndividualRecipient(), r-> context.getString(R.string.SmsMessageRecord_secure_session_reset_s, r.getDisplayName(context)), R.drawable.ic_update_info_16);
@@ -484,7 +486,8 @@ public abstract class MessageRecord extends DisplayRecord {
   public boolean isUpdate() {
     return isGroupAction() || isJoined() || isExpirationTimerUpdate() || isCallLog() ||
            isEndSession() || isIdentityUpdate() || isIdentityVerified() || isIdentityDefault() ||
-           isProfileChange() || isGroupV1MigrationEvent() || isChatSessionRefresh() || isBadDecryptType();
+           isProfileChange() || isGroupV1MigrationEvent() || isChatSessionRefresh() || isBadDecryptType() ||
+           isChangeNumber();
   }
 
   public boolean isMediaPending() {
diff --git a/app/src/main/java/org/thoughtcrime/securesms/jobs/JobManagerFactories.java b/app/src/main/java/org/thoughtcrime/securesms/jobs/JobManagerFactories.java
index 0a6cdcb7b..e8ede0681 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/jobs/JobManagerFactories.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/jobs/JobManagerFactories.java
@@ -131,6 +131,7 @@ public final class JobManagerFactories {
       put(PushNotificationReceiveJob.KEY,            new PushNotificationReceiveJob.Factory());
       put(PushTextSendJob.KEY,                       new PushTextSendJob.Factory());
       put(ReactionSendJob.KEY,                       new ReactionSendJob.Factory());
+      put(RecipientChangedNumberJob.KEY,             new RecipientChangedNumberJob.Factory());
       put(RefreshAttributesJob.KEY,                  new RefreshAttributesJob.Factory());
       put(RefreshOwnProfileJob.KEY,                  new RefreshOwnProfileJob.Factory());
       put(RefreshPreKeysJob.KEY,                     new RefreshPreKeysJob.Factory());
diff --git a/app/src/main/java/org/thoughtcrime/securesms/jobs/RecipientChangedNumberJob.kt b/app/src/main/java/org/thoughtcrime/securesms/jobs/RecipientChangedNumberJob.kt
new file mode 100644
index 000000000..3ef284e53
--- /dev/null
+++ b/app/src/main/java/org/thoughtcrime/securesms/jobs/RecipientChangedNumberJob.kt
@@ -0,0 +1,57 @@
+package org.thoughtcrime.securesms.jobs
+
+import org.signal.core.util.logging.Log
+import org.thoughtcrime.securesms.database.DatabaseFactory
+import org.thoughtcrime.securesms.jobmanager.Data
+import org.thoughtcrime.securesms.jobmanager.Job
+import org.thoughtcrime.securesms.recipients.Recipient
+import org.thoughtcrime.securesms.recipients.RecipientId
+
+/**
+ * Insert change number update items in all threads (1:1 and group) with [recipientId].
+ */
+class RecipientChangedNumberJob(parameters: Parameters, private val recipientId: RecipientId) : BaseJob(parameters) {
+
+  constructor(recipientId: RecipientId) : this(
+    Parameters.Builder().setQueue("RecipientChangedNumberJob_${recipientId.toQueueKey()}").build(),
+    recipientId
+  )
+
+  override fun serialize(): Data {
+    return Data.Builder()
+      .putString(KEY_RECIPIENT_ID, recipientId.serialize())
+      .build()
+  }
+
+  override fun getFactoryKey(): String {
+    return KEY
+  }
+
+  override fun onRun() {
+    val recipient: Recipient = Recipient.resolved(recipientId)
+
+    if (!recipient.isBlocked && !recipient.isGroup && !recipient.isSelf) {
+      Log.i(TAG, "Writing a number change event.")
+      DatabaseFactory.getSmsDatabase(context).insertNumberChangeMessages(recipient)
+    } else {
+      Log.i(TAG, "Number changed but not relevant. blocked: ${recipient.isBlocked} isGroup: ${recipient.isGroup} isSelf: ${recipient.isSelf}")
+    }
+  }
+
+  override fun onShouldRetry(e: Exception): Boolean = false
+
+  override fun onFailure() = Unit
+
+  class Factory : Job.Factory<RecipientChangedNumberJob> {
+    override fun create(parameters: Parameters, data: Data): RecipientChangedNumberJob {
+      return RecipientChangedNumberJob(parameters, RecipientId.from(data.getString(KEY_RECIPIENT_ID)))
+    }
+  }
+
+  companion object {
+    const val KEY = "RecipientChangedNumberJob"
+
+    private val TAG = Log.tag(RecipientChangedNumberJob::class.java)
+    private const val KEY_RECIPIENT_ID = "recipient_id"
+  }
+}
diff --git a/app/src/main/java/org/thoughtcrime/securesms/jobs/RefreshAttributesJob.java b/app/src/main/java/org/thoughtcrime/securesms/jobs/RefreshAttributesJob.java
index db472c319..236470011 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/jobs/RefreshAttributesJob.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/jobs/RefreshAttributesJob.java
@@ -103,6 +103,7 @@ public class RefreshAttributesJob extends BaseJob {
                "\n    GV1 Migration? " + capabilities.isGv1Migration() +
                "\n    Sender Key? " + capabilities.isSenderKey() +
                "\n    Announcement Groups? " + capabilities.isAnnouncementGroup() +
+               "\n    Change Number? " + capabilities.isChangeNumber() +
                "\n    UUID? " + capabilities.isUuid());
 
     SignalServiceAccountManager signalAccountManager = ApplicationDependencies.getSignalServiceAccountManager();
diff --git a/app/src/main/java/org/thoughtcrime/securesms/logsubmit/LogSectionCapabilities.java b/app/src/main/java/org/thoughtcrime/securesms/logsubmit/LogSectionCapabilities.java
index 2c0029f04..47d7e2fb5 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/logsubmit/LogSectionCapabilities.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/logsubmit/LogSectionCapabilities.java
@@ -35,11 +35,13 @@ public final class LogSectionCapabilities implements LogSection {
                               .append("GV1 Migration      : ").append(capabilities.isGv1Migration()).append("\n")
                               .append("Sender Key         : ").append(capabilities.isSenderKey()).append("\n")
                               .append("Announcement Groups: ").append(capabilities.isAnnouncementGroup()).append("\n")
+                              .append("Change Number      : ").append(capabilities.isChangeNumber()).append("\n")
                               .append("\n")
                               .append("-- Global").append("\n")
                               .append("GV2                : ").append(self.getGroupsV2Capability()).append("\n")
                               .append("GV1 Migration      : ").append(self.getGroupsV1MigrationCapability()).append("\n")
                               .append("Sender Key         : ").append(self.getSenderKeyCapability()).append("\n")
-                              .append("Announcement Groups: ").append(self.getAnnouncementGroupCapability()).append("\n");
+                              .append("Announcement Groups: ").append(self.getAnnouncementGroupCapability()).append("\n")
+                              .append("Change Number      : ").append(self.getChangeNumberCapability()).append("\n");
   }
 }
diff --git a/app/src/main/java/org/thoughtcrime/securesms/migrations/ApplicationMigrations.java b/app/src/main/java/org/thoughtcrime/securesms/migrations/ApplicationMigrations.java
index fef68986a..1c26ab4bb 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/migrations/ApplicationMigrations.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/migrations/ApplicationMigrations.java
@@ -3,6 +3,7 @@ package org.thoughtcrime.securesms.migrations;
 import android.content.Context;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.VisibleForTesting;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
@@ -40,7 +41,8 @@ public class ApplicationMigrations {
 
   private static final int LEGACY_CANONICAL_VERSION = 455;
 
-  private static final class Version {
+  @VisibleForTesting
+  static final class Version {
     static final int LEGACY                        = 1;
     static final int RECIPIENT_ID                  = 2;
     static final int RECIPIENT_SEARCH              = 3;
@@ -84,9 +86,10 @@ public class ApplicationMigrations {
     static final int STICKER_MY_DAILY_LIFE         = 42;
     static final int SENDER_KEY_3                  = 43;
     static final int CHANGE_NUMBER_SYNC            = 44;
+    static final int CHANGE_NUMBER_CAPABILITY      = 45;
   }
 
-  public static final int CURRENT_VERSION = 43;
+  public static final int CURRENT_VERSION = 45;
 
   /**
    * This *must* be called after the {@link JobManager} has been instantiated, but *before* the call
@@ -372,6 +375,10 @@ public class ApplicationMigrations {
       jobs.put(Version.CHANGE_NUMBER_SYNC, new AccountRecordMigrationJob());
     }
 
+    if (lastSeenVersion < Version.CHANGE_NUMBER_CAPABILITY) {
+      jobs.put(Version.CHANGE_NUMBER_CAPABILITY, new AttributesMigrationJob());
+    }
+
     return jobs;
   }
 
diff --git a/app/src/main/java/org/thoughtcrime/securesms/recipients/Recipient.java b/app/src/main/java/org/thoughtcrime/securesms/recipients/Recipient.java
index 7441c5c8b..741498dd5 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/recipients/Recipient.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/recipients/Recipient.java
@@ -1,7 +1,5 @@
 package org.thoughtcrime.securesms.recipients;
 
-import static org.thoughtcrime.securesms.database.RecipientDatabase.InsightsBannerTier;
-
 import android.content.Context;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
@@ -63,6 +61,8 @@ import java.util.Objects;
 import java.util.UUID;
 import java.util.stream.Collectors;
 
+import static org.thoughtcrime.securesms.database.RecipientDatabase.InsightsBannerTier;
+
 public class Recipient {
 
   private static final String TAG = Log.tag(Recipient.class);
@@ -110,6 +110,7 @@ public class Recipient {
   private final Capability             groupsV1MigrationCapability;
   private final Capability             senderKeyCapability;
   private final Capability             announcementGroupCapability;
+  private final Capability             changeNumberCapability;
   private final InsightsBannerTier     insightsBannerTier;
   private final byte[]                 storageId;
   private final MentionSetting         mentionSetting;
@@ -362,6 +363,7 @@ public class Recipient {
     this.groupsV1MigrationCapability = Capability.UNKNOWN;
     this.senderKeyCapability         = Capability.UNKNOWN;
     this.announcementGroupCapability = Capability.UNKNOWN;
+    this.changeNumberCapability      = Capability.UNKNOWN;
     this.storageId                   = null;
     this.mentionSetting              = MentionSetting.ALWAYS_NOTIFY;
     this.wallpaper                   = null;
@@ -414,6 +416,7 @@ public class Recipient {
     this.groupsV1MigrationCapability = details.groupsV1MigrationCapability;
     this.senderKeyCapability         = details.senderKeyCapability;
     this.announcementGroupCapability = details.announcementGroupCapability;
+    this.changeNumberCapability      = details.changeNumberCapability;
     this.storageId                   = details.storageId;
     this.mentionSetting              = details.mentionSetting;
     this.wallpaper                   = details.wallpaper;
@@ -918,6 +921,10 @@ public class Recipient {
     return announcementGroupCapability;
   }
 
+  public @NonNull Capability getChangeNumberCapability() {
+    return changeNumberCapability;
+  }
+
   /**
    * True if this recipient supports the message retry system, or false if we should use the legacy session reset system.
    */
diff --git a/app/src/main/java/org/thoughtcrime/securesms/recipients/RecipientDetails.java b/app/src/main/java/org/thoughtcrime/securesms/recipients/RecipientDetails.java
index 1f962ff96..628309911 100644
--- a/app/src/main/java/org/thoughtcrime/securesms/recipients/RecipientDetails.java
+++ b/app/src/main/java/org/thoughtcrime/securesms/recipients/RecipientDetails.java
@@ -65,6 +65,7 @@ public class RecipientDetails {
   final Recipient.Capability       groupsV1MigrationCapability;
   final Recipient.Capability       senderKeyCapability;
   final Recipient.Capability       announcementGroupCapability;
+  final Recipient.Capability       changeNumberCapability;
   final InsightsBannerTier         insightsBannerTier;
   final byte[]                     storageId;
   final MentionSetting             mentionSetting;
@@ -121,6 +122,7 @@ public class RecipientDetails {
     this.groupsV1MigrationCapability = settings.getGroupsV1MigrationCapability();
     this.senderKeyCapability         = settings.getSenderKeyCapability();
     this.announcementGroupCapability = settings.getAnnouncementGroupCapability();
+    this.changeNumberCapability      = settings.getChangeNumberCapability();
     this.insightsBannerTier          = settings.getInsightsBannerTier();
     this.storageId                   = settings.getStorageId();
     this.mentionSetting              = settings.getMentionSetting();
@@ -177,6 +179,7 @@ public class RecipientDetails {
     this.groupsV1MigrationCapability = Recipient.Capability.UNKNOWN;
     this.senderKeyCapability         = Recipient.Capability.UNKNOWN;
     this.announcementGroupCapability = Recipient.Capability.UNKNOWN;
+    this.changeNumberCapability      = Recipient.Capability.UNKNOWN;
     this.storageId                   = null;
     this.mentionSetting              = MentionSetting.ALWAYS_NOTIFY;
     this.wallpaper                   = null;
diff --git a/app/src/main/res/drawable-night/ic_phone_16.xml b/app/src/main/res/drawable-night/ic_phone_16.xml
new file mode 100644
index 000000000..1244512b1
--- /dev/null
+++ b/app/src/main/res/drawable-night/ic_phone_16.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="16dp"
+    android:height="16dp"
+    android:viewportWidth="16"
+    android:viewportHeight="16">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M2.41,3.05a3.15,3.15 0,0 0,-0.16 3.12,13.11 13.11,0 0,0 7.58,7.58A3.15,3.15 0,0 0,13 13.59a2.83,2.83 0,0 0,1 -1.16,1.27 1.27,0 0,0 -0.4,-1.62l-2,-1.38a1.27,1.27 0,0 0,-1.65 0.16c-0.22,0.24 -0.37,0.4 -0.54,0.6a0.65,0.65 0,0 1,-0.87 0.12A15.06,15.06 0,0 1,7 9a15.06,15.06 0,0 1,-1.29 -1.5,0.65 0.65,0 0,1 0.12,-0.87l0.6,-0.54a1.27,1.27 0,0 0,0.16 -1.65l-1.38,-2a1.27,1.27 0,0 0,-1.62 -0.4A2.83,2.83 0,0 0,2.41 3.05Z"/>
+</vector>
diff --git a/app/src/main/res/drawable/ic_phone_16.xml b/app/src/main/res/drawable/ic_phone_16.xml
new file mode 100644
index 000000000..5af70338b
--- /dev/null
+++ b/app/src/main/res/drawable/ic_phone_16.xml
@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="16dp"
+    android:height="16dp"
+    android:viewportWidth="16"
+    android:viewportHeight="16">
+  <path
+      android:fillColor="#FF000000"
+      android:pathData="M11.17,14.14a4.94,4.94 0,0 1,-1.63 -0.32,12.87 12.87,0 0,1 -4.47,-2.89A12.87,12.87 0,0 1,2.18 6.46,3.49 3.49,0 0,1 2.39,3.1h0a3.17,3.17 0,0 1,1.22 -1,1.69 1.69,0 0,1 2.18,0.51L7.08,4.42A1.68,1.68 0,0 1,6.86 6.6l-0.56,0.52s-0.07,0.1 0,0.13A11.37,11.37 0,0 0,7.41 8.59,10.62 10.62,0 0,0 8.75,9.75s0.09,0 0.13,0c0.17,-0.2 0.31,-0.35 0.52,-0.57a1.68,1.68 0,0 1,2.18 -0.22l1.84,1.29A1.68,1.68 0,0 1,14 12.35a3.15,3.15 0,0 1,-1 1.26A3,3 0,0 1,11.17 14.14ZM4.42,2.86a0.68,0.68 0,0 0,-0.31 0.08,2.13 2.13,0 0,0 -0.9,0.74h0a2.47,2.47 0,0 0,-0.09 2.45,11.77 11.77,0 0,0 6.75,6.75 2.47,2.47 0,0 0,2.45 -0.09,2.12 2.12,0 0,0 0.72,-0.85 0.7,0.7 0,0 0,-0.19 -0.91L11,9.74a0.67,0.67 0,0 0,-0.88 0.08c-0.21,0.22 -0.34,0.36 -0.5,0.55a1.09,1.09 0,0 1,-1.48 0.18A13.27,13.27 0,0 1,6.7 9.3,13.27 13.27,0 0,1 5.45,7.85a1.09,1.09 0,0 1,0.18 -1.48c0.19,-0.16 0.33,-0.29 0.55,-0.5A0.67,0.67 0,0 0,6.26 5L5,3.15A0.73,0.73 0,0 0,4.42 2.86Z"/>
+</vector>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 4fb18baf9..bbd02b0dd 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1209,6 +1209,7 @@
     <string name="MessageRecord_you_marked_your_safety_number_with_s_unverified">You marked your safety number with %s unverified</string>
     <string name="MessageRecord_you_marked_your_safety_number_with_s_unverified_from_another_device">You marked your safety number with %s unverified from another device</string>
     <string name="MessageRecord_a_message_from_s_couldnt_be_delivered">A message from %s couldn\'t be delivered</string>
+    <string name="MessageRecord_s_changed_their_number_to_a_new_number">%1$s changed their number to a new number.</string>
 
     <!-- Group Calling update messages -->
     <string name="MessageRecord_s_started_a_group_call_s">%1$s started a group call · %2$s</string>
@@ -1950,6 +1951,7 @@
     <string name="ConversationUpdateItem_call_is_full">Call is full</string>
     <string name="ConversationUpdateItem_invite_friends">Invite friends</string>
     <string name="ConversationUpdateItem_enable_call_notifications">Enable Call Notifications</string>
+    <string name="ConversationUpdateItem_update_contact">Update contact</string>
     <string name="ConversationUpdateItem_no_groups_in_common_review_requests_carefully">No groups in common. Review requests carefully.</string>
     <string name="ConversationUpdateItem_no_contacts_in_this_group_review_requests_carefully">No contacts in this group. Review requests carefully.</string>
     <string name="ConversationUpdateItem_view">View</string>
@@ -3505,7 +3507,7 @@
     <string name="ChangeNumberEnterPhoneNumberFragment__new_phone_number">New phone number</string>
     <string name="ChangeNumberEnterPhoneNumberFragment__the_phone_number_you_entered_doesnt_match_your_accounts">The phone number you entered doesn\'t match your account\'s.</string>
     <string name="ChangeNumberEnterPhoneNumberFragment__you_must_specify_your_old_number_country_code">You must specify your old number\'s country code</string>
-    <string name="ChangeNumberEnterPhoneNumberFragment__you_must_specify_your_old_phone_number">You must specify your old number</string>
+    <string name="ChangeNumberEnterPhoneNumberFragment__you_must_specify_your_old_phone_number">You must specify your old phone number</string>
     <string name="ChangeNumberEnterPhoneNumberFragment__you_must_specify_your_new_number_country_code">You must specify your new number\'s country code</string>
     <string name="ChangeNumberEnterPhoneNumberFragment__you_must_specify_your_new_phone_number">You must specify your new phone number</string>
 
diff --git a/app/src/test/java/org/thoughtcrime/securesms/migrations/ApplicationMigrationsTest.kt b/app/src/test/java/org/thoughtcrime/securesms/migrations/ApplicationMigrationsTest.kt
new file mode 100644
index 000000000..2c8c68e1c
--- /dev/null
+++ b/app/src/test/java/org/thoughtcrime/securesms/migrations/ApplicationMigrationsTest.kt
@@ -0,0 +1,19 @@
+package org.thoughtcrime.securesms.migrations
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import java.lang.reflect.Field
+import java.lang.reflect.Modifier
+
+class ApplicationMigrationsTest {
+  @Test
+  fun `ensure ApplicationMigration CURRENT_VERSION matches max version`() {
+    val fields: Array<Field> = ApplicationMigrations.Version::class.java.declaredFields
+
+    val maxField: Int? = fields.filter { Modifier.isStatic(it.modifiers) && it.type == Int::class.java }
+      .map { it.getInt(null) }
+      .maxOrNull()
+
+    assertEquals(ApplicationMigrations.CURRENT_VERSION, maxField)
+  }
+}
diff --git a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/account/AccountAttributes.java b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/account/AccountAttributes.java
index 3e17c77d7..78f579877 100644
--- a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/account/AccountAttributes.java
+++ b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/account/AccountAttributes.java
@@ -9,8 +9,6 @@ package org.whispersystems.signalservice.api.account;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
 
-import org.whispersystems.signalservice.api.profiles.SignalServiceProfile;
-
 public class AccountAttributes {
 
   @JsonProperty
@@ -134,16 +132,20 @@ public class AccountAttributes {
     @JsonProperty
     private boolean announcementGroup;
 
+    @JsonProperty
+    private boolean changeNumber;
+
     @JsonCreator
     public Capabilities() {}
 
-    public Capabilities(boolean uuid, boolean gv2, boolean storage, boolean gv1Migration, boolean senderKey, boolean announcementGroup) {
+    public Capabilities(boolean uuid, boolean gv2, boolean storage, boolean gv1Migration, boolean senderKey, boolean announcementGroup, boolean changeNumber) {
       this.uuid              = uuid;
       this.gv2               = gv2;
       this.storage           = storage;
       this.gv1Migration      = gv1Migration;
       this.senderKey         = senderKey;
       this.announcementGroup = announcementGroup;
+      this.changeNumber      = changeNumber;
     }
 
     public boolean isUuid() {
@@ -169,5 +171,9 @@ public class AccountAttributes {
     public boolean isAnnouncementGroup() {
       return announcementGroup;
     }
+
+    public boolean isChangeNumber() {
+      return changeNumber;
+    }
   }
 }
diff --git a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/profiles/SignalServiceProfile.java b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/profiles/SignalServiceProfile.java
index 544e6eadd..7f5b0fdf3 100644
--- a/libsignal/service/src/main/java/org/whispersystems/signalservice/api/profiles/SignalServiceProfile.java
+++ b/libsignal/service/src/main/java/org/whispersystems/signalservice/api/profiles/SignalServiceProfile.java
@@ -127,6 +127,9 @@ public class SignalServiceProfile {
     @JsonProperty
     private boolean announcementGroup;
 
+    @JsonProperty
+    private boolean changeNumber;
+
     @JsonCreator
     public Capabilities() {}
 
@@ -149,6 +152,10 @@ public class SignalServiceProfile {
     public boolean isAnnouncementGroup() {
       return announcementGroup;
     }
+
+    public boolean isChangeNumber() {
+      return changeNumber;
+    }
   }
 
   public ProfileKeyCredentialResponse getProfileKeyCredentialResponse() {
diff --git a/libsignal/service/src/test/java/org/whispersystems/signalservice/api/account/AccountAttributesTest.java b/libsignal/service/src/test/java/org/whispersystems/signalservice/api/account/AccountAttributesTest.java
index 0091caf06..276bee4a3 100644
--- a/libsignal/service/src/test/java/org/whispersystems/signalservice/api/account/AccountAttributesTest.java
+++ b/libsignal/service/src/test/java/org/whispersystems/signalservice/api/account/AccountAttributesTest.java
@@ -16,7 +16,7 @@ public final class AccountAttributesTest {
                                                         "reglock1234",
                                                         new byte[10],
                                                         false,
-                                                        new AccountAttributes.Capabilities(true, true, true, true, true, true),
+                                                        new AccountAttributes.Capabilities(true, true, true, true, true, true, true),
                                                         false));
     assertEquals("{\"signalingKey\":\"skey\"," +
                  "\"registrationId\":123," +
@@ -28,18 +28,18 @@ public final class AccountAttributesTest {
                  "\"unidentifiedAccessKey\":\"AAAAAAAAAAAAAA==\"," +
                  "\"unrestrictedUnidentifiedAccess\":false," +
                  "\"discoverableByPhoneNumber\":false," +
-                 "\"capabilities\":{\"uuid\":true,\"storage\":true,\"senderKey\":true,\"announcementGroup\":true,\"gv2-3\":true,\"gv1-migration\":true}}", json);
+                 "\"capabilities\":{\"uuid\":true,\"storage\":true,\"senderKey\":true,\"announcementGroup\":true,\"changeNumber\":true,\"gv2-3\":true,\"gv1-migration\":true}}", json);
   }
 
   @Test
   public void gv2_true() {
-    String json = JsonUtil.toJson(new AccountAttributes.Capabilities(false, true, false, false, false, false));
-    assertEquals("{\"uuid\":false,\"storage\":false,\"senderKey\":false,\"announcementGroup\":false,\"gv2-3\":true,\"gv1-migration\":false}", json);
+    String json = JsonUtil.toJson(new AccountAttributes.Capabilities(false, true, false, false, false, false, false));
+    assertEquals("{\"uuid\":false,\"storage\":false,\"senderKey\":false,\"announcementGroup\":false,\"changeNumber\":false,\"gv2-3\":true,\"gv1-migration\":false}", json);
   }
 
   @Test
   public void gv2_false() {
-    String json = JsonUtil.toJson(new AccountAttributes.Capabilities(false, false, false, false, false, false));
-    assertEquals("{\"uuid\":false,\"storage\":false,\"senderKey\":false,\"announcementGroup\":false,\"gv2-3\":false,\"gv1-migration\":false}", json);
+    String json = JsonUtil.toJson(new AccountAttributes.Capabilities(false, false, false, false, false, false, false));
+    assertEquals("{\"uuid\":false,\"storage\":false,\"senderKey\":false,\"announcementGroup\":false,\"changeNumber\":false,\"gv2-3\":false,\"gv1-migration\":false}", json);
   }
 }
\ No newline at end of file