SIM cards have become a universal aspect of modern smartphone usage, but the technology and meaning behind the name dates more than three decades.

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.

SIM Card Technology: Calling system is amazing. It connects everyone, be it friends or strangers. In the olden days, letters used to connect people. Today, 'call' is carrying on this tradition. Or ...