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.

The e-SIM launch is part of BSNL’s broader network modernization strategy, which includes upgrading infrastructure to support both 4G and 5G technologies. The company has implemented an over-the-air ...

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 ...