Fix crash when enter long phone number on registration.

app/src/main/res/layout/phone_text.xml

@@ -12,6 +12,7 @@
     android:background="@color/transparent"
     android:singleLine="true"
     android:inputType="phone"
+    android:maxLength="18"
     android:saveEnabled="false"
     android:hint="@string/RegistrationActivity_phone_number_description"
     tools:text="867-5309" />