Sareena was a senior editor for CNET covering the mobile beat, including device reviews. She is a seasoned multimedia journalist with more than a decade's worth of experience producing stories for ...

Your SIM card is one of the most important aspects of your iPhone – it’s the only way to connect to your carrier's network. And while physical SIM cards remain a viable option for many people with ...

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 ...

If your new phone no longer supports SIM cards, or you don't want to use them anymore, you can convert to eSIM instead. I started my career with CNET all the way back in 2005, when the (original) ...

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, ...

You're probably already familiar with the SIM card, a tiny chip in your phone that connects it to your cell phone carrier of choice. For years, this chip was on a physical card that you could swap in ...