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 ...

Looks like iPhone 4 users wanting an unlock for 4.1 or 4.2.1 will have to wait till Monday to see how the crash for the base band is coming along. Limera1n.cc have posted the following guide showing ...