I have a 2g that i've been running on tmobile for 6 months, absolutely no problems whatsoever. My dumb ass tried to upgrade to 2.0 yesterday because well i have no idea and no patience. After doing so, my phone was locked and unuseable stuck at the screen with the usb cable and itunes symbol. I then downgraded back to 1.1.4. So now my phone is not locked anymore and goes to the normal IPhone screen, but it will not connect to TMOBILE at all. I get absolutely no service, and have no idea what to do. Once i got it back to 1.1.4 i did what i did when i first got the phone and unlocked and jailbroke it with ziphone. I have tried win pwn, iliberty and ziphone now and no luck.. Can someone please help me out!!! I'm on vacay back home for a week and can't get ahold of any friends, im desparate.