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 ...

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 ...

EVER heard of an eSIM? Ditch the SIM cards for good and upgrade your iPhone today. Here's a quick guide to how eSIMs work and why even older iPhones can still use the clever digital tech. A SIM card ...