Originally Posted by takeshi
Which carrier is the other phone with? TMO? Is it actually unlocked?
The blackberry carrier is AT&T. My phone was bought without contract, unlocked. I can use all the SIM cards I tried, except this from AT&T Blackberry.
Is there any chance that AT&T detects that the handset is "not original" and thus blindly disables it? (i.e. the plan is Blackberry but the handset is not a blackberry? --- sounds a bit weired reason, but ...)