I have an AT&T (GSM) iPhone 4. If I were to upgrade to an iPhone 5, could I simply pop the SIM out of my iPhone 4 and continue using it on wifi only? Would I also need to get the SIM deactivated ...
Possible Duplicate: Can you use an iPhone without a SIM card as an iPod Touch? I bought an iPhone 3G that is currently off and doesn't have a sim card. Is there any way I can enable the ...