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.

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.

The sim card that exists inside your phone is what connects your phone to your specific cellular network. For most of us we might not even realize it’s there. When we get a new phone from our carrier, ...

If your new phone no longer supports SIM cards, or you don't want to use them anymore, you can convert to eSIM instead.

Europol has dismantled a large-scale SIM farm operation, arresting seven suspects and seizing 1,200 SIM-box devices ...

The agency says it found a network of some 300 servers and 100,000 SIM cards—enough to knock out cell service in the NYC area ...

For many years, mobile phones received cellular service through a physical SIM (subscriber identity module) card that connected your handset to your phone carrier. These physical SIM cards made it ...