so i wanna get a used iphone 4s att version off CL for the wife, but how can i tell if i am getting the att version though? i know the physical difference from the 4 and 4s, and that's about it. i know it's best to just pop a att micro sim in there to test it out, but i'm with tmo. any tips or cautions to take is appreciated. tks! btw, i'm in contact with a couple local guys selling the 32gb 4s in mint condition for $500 and $475, does it sound like a decent deal? TIA.