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 ...

Once you’ve activated your iPhone with your carrier, it should continue to work on the cellular network without any problems as long as you’re within range of a tower. Nevertheless, the vagaries of ...

The iPhone 7 has been available for about a month, and we think it’s a great smartphone. But until now, you’ve had to have your new iPhone to a carrier, even if you bought it off contract. Not any ...