So my dad says i can possibly get a new phone for my birthday in a few months and i have a blackberry curve right now, its really old though. all i have is calling and texting, which is fine cuz i dont need internet. but i want th bb torch but that is on AT&T and we have T-Mobile. so if i buy a bb torch from best buy can i just stick my SIM card into it or what? thanks for the help!