Open Radar

 
Summary:
If an iMessage conversation between user A and user B has user A’s phone number as the address, and user A’s phone number changes—for example, after a SIM card swap when traveling internationally—user A sends a message to that conversation, the message will transparently be sent from user A’s new phone number, even if user A has selected an email address in iMessage’s “start new conversations from” setting.

Steps to Reproduce:
1. User A has a phone number and email address configured for receiving iMessages.
2. User A chooses their email address in “start new conversations from” in Settings > Messages > Send & Receive
3. User B sends an iMessage to User A’s phone number
4. User A changes their SIM card, and receives a new phone number
5. User A replies to the iMessage from User B

Expected Results:
User A’s reply is sent from their default “start new conversations from” address, their email address, because the phone number is no longer available.

Actual Results:
User A’s reply is sent from their new phone number, and User B is more likely to confused by receiving an iMessage from an unknown phone number.

Version:
iOS 8.3 (12F70)


Configuration:
iPhone 6