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 ...

You may have had AT&T SIM (Subscriber Identity Module) card problems on your iPhone before or received the notification "Airtel SIM not provisioned." This happens sometimes, and the reason is fairly ...

Have you been holding off on purchasing that shiny new Apple iPhone until someone figures out how to unlock it? While that day isn't exactly here yet, a major milestone has been achieved. By using a ...

AT&T CEO Ralph de la Vega said in an interview this week that a smaller SIM card is a "no-brainer" and his company is looking into it, but declined to make the direct connection to Apple that the ...

While it's now common knowledge that unlocked iPhones, hacked to work on networks other than AT&T's, are -- for the most part -- crippled by the iPhone 1.1.1 software/firmware update (as warned by ...