I'm completely unable to sync to my Mac after porting to T-Mobile! It seems as if iTunes goes online momentarily when you connect your iPhone to your computer, because I am now getting a message on iTunes (when the iPhone source is selected at the left) stating "There is a problem with your iPhone." I notice whenever the iPhone is docked to a Mac, the iTunes music store pops up momentarily, so it's blatantly obvious iTunes is checking the iPhone against AT&T to make sure it's a legitimate at&t account (I'm assuming). I disabled my mac's internet connection and re-connected the iPhone, and the iPhone information won't even show up! The iPhone (1.1.3) works completely fine independent-of-iTunes (7.6). Is this some new system to verify all iPhones are on AT&T only? Is there some way to get around this? The iPhone works fine on T-Mo, but I can't sync with my mac!