eSIM means you can also get rid of the SIM card reader, which means you no longer need a SIM card tray, a way to open it, and an opener tool. If you're making a waterproof device, you no longer ...

A physical SIM card is essentially a tiny card with a chip that connects your phone to your wireless carrier. It contains identifying information like your account info and phone number.

Sareena is 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 ...