I have a jailbroken and unlocked iPhone 3G. I attempted to use a sim from an old att gophone. It didnt work. I then called att and tried to use a new att sim card with a different IMEI and transfer my old number, this locked the sim to the IMEI I gave them and deactivated the old sim. I am now without a working phone. I need to know if T-mobile will support an unlocked iphone on their pre paid plans. Will I have to give them the IMEI from the iPhone? If I use a different IMEI will it lock the sim to the phone like with att? Thankyou.