Subscriber Identification Module (SIM) Cards

1. What are Subscriber Identification Module (SIM) Cards?

A SIM card (Subscriber Identity Module or User Identity Module) is an integrated circuit (IC) that securely stores the International Mobile Subscriber Identity (IMSI) and its associated cryptographic keys, used to identify and authenticate users on mobile devices such as phones and computers.

 

2. How do Subscriber Identification Module (SIM) Cards Work?

The SIM card is based on Subscriber Identity Module (SIM) technology. A SIM card contains a unique serial number, the International Mobile Subscriber Identity (IMSI), security authentication and encryption information, temporary information related to the local network, a list of services the user can access, and stored value for SIM card stored-value applications.

 

3. What are the Types of Subscriber Identification Module (SIM) Cards?

Subscriber Identification Module (SIM) Cards

Removable User Identification Module (R-UIM) Cards

Universal Integrated Circuit Card (UICC) Cards

Embedded SIM (eSIM) Cards

Multi-SIM Cards

Dual-SIM Cards