A SIM card, or subscriber identity module, is a small card in your cellphone that lets you place phone calls, send text messages, and more.

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 ...

When traveling internationally, staying connected often requires a bit of planning. One solution a lot of travelers consider is an international SIM card. But do you really need one? Let’s dive into ...

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, ...

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 ...

A dual-SIM setup lets you use one phone to make and receive calls and texts from two numbers. It's also super convenient and can save you serious cash when traveling. We show you how to use two SIMs ...