My unlocked 3GS was having a few small issues so I decided to restore it again with Pwnage tool and unlock with ultrasn0w. Everything went ok but now I don't have any cell signal!! It says searching but will never find carriers and then eventually says no signal. Sim card is fine as I have tried it in my old phone. I have restored it 2-3 times but it will never find signal. Desperate for any ideas!!! Thanks!!!