I'm considering losing my blackberry and wanted to try my partners iphone3gs since he plans to upgrade. I have successully jailbroken 4.3.3 and ran redsnow but my tmobile sim doesn't get signal. In my reading since my baseband is 05.16.02 it will not unlock the phone. Not certain what is the best fix- I'm obviously a newby but have read and tried till my eyes are crossed- any help would be greatly appreciated!