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.

Once you’ve activated your iPhone with your carrier, it should continue to work on the cellular network without any problems as long as you’re within range of a tower. Nevertheless, the vagaries of ...

A SIM card, or subscriber identity module card, is essential component of any phone. It connects your device to a cellular network and stores vital information, including your phone number. Many ...

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.

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