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.

Identity thieves have a new way of gaining access to your finances. Even if you’ve frozen your credit report, they can grab your money by taking over your phone number. It’s called “SIM swapping.” ...

A SIM card, or subscriber identity module card, is essential component of any phone. It connects your device to a cellular network and stores vital information, including your phone number. Many ...