My girlfriends iMessage just stopped working out of nowhere. when you go into the settings it says "iMessage Activation unsuccessful" then it wants her to sign in with her apple ID. when she gos to sign in she can hit next once it shows her email when you go to hit next again it bounces her out back to the original login screen. Nothing has changed on her phone we have been using imessage since launch with no issues....she didnt even update to 5.0.1. any idea why this happened? And is there a fix besides restoring?