As an experiment, I tried putting the sim card from my att activated 2g original iphone, into a new 3g phone of a co-worker. (besides the whole "you got your chocolate in my peanut butter moment") it ...

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 ...

The SIM card in your iPhone is crucial to your making calls, but it's also small enough to lose, and easy enough to put in the wrong way. Here's how to successfully remove a SIM card, and put one back ...