SIM (Subscriber Identity Module)

A SIM (Subscriber Identity Module) is a small card used in mobile phones that stores essential information needed to connect to a cellular network. It contains unique identifiers, such as the IMSI (International Mobile Subscriber Identity), and security data, allowing your device to authenticate with your carrier. The SIM also holds contacts and settings, enabling you to switch phones easily by transferring the card. Essentially, it acts as your device’s digital passport, enabling communication, calls, messages, and data services on your mobile network.