I sold my iPhone 4 last week and the buyer received it today. I just received notification on my Macbook and iPhone 5 that the old device has just been activated on iMessage and can send/receive iMessages using the two email addresses that I have linked to iMessage. I've attached a picture of the notification. The person changed the name of the iPhone to "Cierra's Lifeline." I restored the phone's content and settings before shipping. I have an AppleCare support call scheduled for 5pm. Has anyone dealt with this problem or have any idea of how to fix it?