My 3GS is jailbroken and (apparently) unlocked on 3.1.2. I say apparently as it mounts in iTunes and will allow non AT&T sims to be inserted but "cannot find the sim"? My Wifi works fine, but I cannot make a call (obviously). I've tried the usual suspects of resetting the network settings, turning airplane mode on/off & removing & re-inserting the sim... no change What am i missing? How do I get my 3GS to see the T-Mobile sim??? Appreciate the help, thanks.