As the iPhone Air goes eSIM-only, and some of the best Android phones also drop the SIM card tray, here's a look at the eSM, ...

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. I started my career with CNET all the way back in ...

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 ...

The Universal Subscriber Identification Module, known as USIM and SIM, is evolving. The traditional plastic card-based SIMs have been shrinking in size, and now, embedded SIMs or eSIMs are being ...