The full form of SIM is Subscriber Identity Module. It's also sometimes referred to as Subscriber Identification Module.
Understanding the SIM Card
A SIM card, containing the SIM, is a small chip that stores information identifying a mobile phone user on a mobile network. This information allows your phone to connect to your carrier's network and enables features such as making calls, sending text messages, and accessing mobile data. The SIM card securely stores the International Mobile Subscriber Identity (IMSI) number, a unique identifier for your mobile phone subscription.
Key Components & Functionality:
- International Mobile Subscriber Identity (IMSI): A unique number identifying your mobile subscription on the network.
- Security Features: The SIM card incorporates security measures to protect your data and prevent unauthorized access.
- Smart Card Technology: SIMs utilize smart card technology, a specialized type of integrated circuit (IC) for secure data storage. Source: NIST SP 800-101 Rev. 1
This information is consistent across numerous sources, including Byju's, Quora, and Leap Scholar. Source: Byju's, Source: Quora, Source: Quora, Source: Leap Scholar
It is important to note that SIM can also stand for other things, such as the Safety Information Monitoring System (SIMS) used by the ICAO. Source: ICAO However, in the context of mobile phones and cellular technology, SIM almost exclusively refers to the Subscriber Identity Module.
