Subscriber Identification Module (SIM) Cards
Subscriber Identification Module (SIM) cards are integral components in mobile communication devices, serving as the bridge between the user and the network provider. These small, portable chips store essential data such as the International Mobile Subscriber Identity (IMSI) and authentication keys, enabling secure access to the network. When inserted into a mobile device, the SIM card communicates with the network to authenticate the user's identity, allowing for voice, text, and data services. Operating on a microcontroller with an embedded operating system, SIM cards utilize encryption to ensure secure communication, making them indispensable in modern telecommunication.