SIM cards

A SIM card (Subscriber Identity Module) is a small chip inserted into a mobile device that stores your phone number, contacts, and carrier information. It authenticates your device on the cellular network, allowing you to make calls, send texts, and access the internet. The SIM card enables communication between your phone and the mobile provider's network, acting as a digital identity card. It is replaceable, so switching carriers or devices often involves swapping the SIM card. Overall, it’s a crucial component that connects your device securely to your mobile service.