A SIM card stores your subscriber identity data, which is needed to connect to a carrier's network. But do you still need one in 2025?

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.

Just insert a different SIM card and you can connect to a different cell network. For years, some phones supported having dual SIM cards.

As 5G networks spread across the globe, a new SIM card will be needed for users to access faster service -- with better security, privacy, and battery life.

There’s an easy way to get zero roaming fees, inexpensive internet service and cheap phone calls when you travel. The trick is the SIM card, a tiny, removable chip, inside your phone. What is a ...

Physical SIM Card vs. eSIM: What Sets Them Apart and Which Should You Choose? These two ways of connecting your phone to a cellular network are very different.