We purchased an iPhone 8GB today (after waiting in line at the local AT&T store for about 8 hours), only to find that once home and opened, the device lacked a SIM card. iTunes and the phone both ...

What is a SIM card used for? A SIM card, or a subscriber identity module/subscriber identification module, is a tiny memory card that contains unique information and is linked to a particular network ...

A user has an iPhone 3G from a relative in France. Has the phone, but no SIM card. Can't activate it initially because he has T-Mobile, so no valid SIM at all. I can't even use an ATT SIM (in US) so ...