I have an Iphone 3GS running ios 5.0.1 on firmware 05.16.05 and when running ultrasnow to unlock i get "Could not activate cellular data network" i click ok and carry on anyway but upon putting my sim card into the device it will not work on t-mobile, it does not find any networks... anyone able to help? Trying to be able to use the phone on t-mobile network in the US... thank you