Although cell phones have changed significantly in the last few decades, they still need a SIM. Some phones have moved to eSIMs, but many still use physical SIM cards. If you have a working phone, ...

SIM cards have become a universal aspect of modern smartphone usage, but the technology and meaning behind the name dates more than three decades.

Cingular mailed me a new SIM card with a letter stating that I should take out the old chip and put in the new one. So I took out the old one, put in new one, called to activate it, and the phone ...

SIM swappers have adapted their attacks to steal a target's phone number by porting it into a new eSIM card, a digital SIM stored in a rewritable chip present on many recent smartphone models.

You don't need a SIM card and cellular service to use most features of today's iPhones and Android phones. Most apps and services run just fine as long as you have access to WiFi, and you can even set ...

When your phone struggles to find signal, don't just blame your carrier. Try these troubleshooting tips first.