HI, I was wondering if anyone here can help me out. i live in a place where there is t mobile signal here and at&t, what i wana do(for personal reasons) is make my signal switch to at&t, now i have been able to do that but i can only make SOS(emergency) calls when i switch it to at&t. is there a way i can switch it to at&t and make any reguler calls. with it? i have tmobile... and i have the blackberry 8320.