Let's face it: Most of us don't call our own phones very often. If you're like most people, this means you probably don't know your own phone number off-hand, especially if you rarely give it out to ...

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 ...

Losing track of your own phone number is disconcerting. It’s also something that happens frequently enough. Human memory is imperfect anyway. Making it an issue for just about everybody at some point.