Once I got the iOS 6 update, I had to re-login to use iMessage. I use my same login and password that I've been using, and that works for everything else. I enter the info, hit next, it says 'Verifying', then takes me back to the login screen. No error message saying my password was incorrect, or anything. I've done this about 100 times, and the same thing keeps happening. Any ideas what the problem is? Thanks!