Bought my phone off eBay a year ago locked. Got a friend to unlock using iLiberty or ZiPhone (don't remember which one) on v. 1.1.3. It's been working flawless on T-mobile until recently. I plugged it into the comp and upgraded iTunes and also upgraded it to the 3.0 OS by pushing the "upgrade" button. I didn't restore to a custom 3.0 firmware but upgraded directly through iTunes. I then ran redsn0w and the phone is jailbroken with cydia/icy installed but I still get no service. When I plug the iPhone in, iTunes still recognizes it but I don't have service with my sim card. Does anyone know a fix to his. I've tried downgrading to 2.0, 2.1, 1.1.4, 1.1.3 and back to 3.0 but I still can't get this thing to unlock!!!