I have an unlocked Blackberry Torch originally from the U.K, i got it unlocked specifically because i'll be out in the U.S.A for 9 months, when i put in my AT&T sim card , i get an 'Invalid SIM' error message and 'SOS' on the signal bar! although when im looking at the mobile network option, it says my provder is AT&T? occasionally when i flip between 2 and 3G the signal bars will appear for a few seconds then go back to SOS!! can anyone help me?
