going from pc to mac so i'm new to the mac world. i have a 4s on vzn. however, my brother gave me his old A1203 2g phone WITHOUT a sim card. i want to use it as an ipod for music but can't activate it on itunes w/o a sim card. should i buy a sim card on amazon or a used one on line? AND if i do buy a sim card on amazon, will a 3g card do the trick? thanks in advance for advice!!!