What is USIM universal SIM

The USIM (Universal Subscriber Identity Module):

1. Purpose and Function:
   • A USIM is a type of smart card used in mobile phones and other mobile devices.
   • It securely stores subscriber identity information and authentication credentials.
   • The USIM serves as the functional equivalent of the SIM (Subscriber Identity Module) in GSM devices.
2. Network Compatibility:
   • While both SIM and USIM cards identify and authenticate users on mobile networks, they differ in terms of technology and network compatibility:
     • SIM: Primarily designed for 2G networks using GSM technology.
     • USIM: Tailored for 3G and 4G networks (UMTS and LTE technologies).
3. Security Features:
   • USIM cards offer enhanced security compared to traditional SIM cards:
     • Stronger Encryption: USIMs use robust encryption algorithms.
     • Mutual Authentication: Ensures secure communication between the card and the network.
     • Secure Credential Storage: Stores user credentials more securely.
4. Functionality:
   • The USIM performs critical functions:
     • Subscriber Information: Stores user-related data.
     • Authentication: Verifies the user’s identity.
     • Ciphering: Ensures secure data transmission.