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 ...

A SIM (Subscriber Identity Module) is a tiny bit of circuitry that uniquely identifies your cellular modem in a phone, tablet, or other device to nearby cellular networks to allow access for voice, ...

These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another.

Rumors in recent years have said that the iPhone would abandon its physical SIM card in the US. Apple did just that with the iPhone 14 series. Rather than a SIM card, the US versions rely on eSIMs ...