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.

If your new phone no longer supports SIM cards, or you don't want to use them anymore, you can convert to eSIM instead.

SIM cards have been an integral yet forgettable aspect of owning a smartphone over the past few decades. For most users, the SIM card defines the basic commercial relationship they have with their ...