I had my iphone on 5.0, running my gevey sim on 4.10.01 PBB. For months i was using a gevey tehered unlock with tmobile perfectly fine. Recently it stoped working and i restored to see if it was a firmware problem. No cigar. I downgraded to 4.3.3 with my saved SHSH blobs, and tried using my gevey, but nothing worked. I then tried using a ACTIVE AT&T simcard, and one bar was shown, but then NO SERVICE. I tried that active at&t simcard with another iphone 4, and it worked fine, so it must be my phone or firmware? I have spent over 18 hours over the last 3 days.. please help.