Hello my mother has given me her old iPhone because she got iPhone 3g. I am in need of a sim card but do not live near an ATT corporate store. My question is, if I bought a Gophone with sim card at best buy, and put that unactivated sim into my iPhone, could I proceed with iPhone activation? I am planning on using the 2 yr contract so I don't want prepaid. Other than that, would a kiosk at a mall sell me a SIM? Thanks!