Every month, you pay a bill for cell phone service. Somehow, that access needs to make it to your device. The SIM card, or "subscriber identity module," connects your phone with your phone bill.

A subscriber identity module is a removable smart card for mobile phones. SIM cards store the required information to identify the mobile device. It also contains data required for voice ...

so you can move your SIM card between phones without losing your contacts. The SIM card was invented by the German smart card manufacturer Giesecke and Devrient in 1991. First-generation SIMs came ...

Today’s Android phones are significantly more advanced than they were just a few years ago, but one thing hasn’t changed: the need for a SIM card. Every phone needs a physical or eSIM card to ...