An enhancement of the subscriber identity module (SIM) card used in Global System for Mobile Communications (GSM) networks. The USIM is designed to be used in third-generation (3G) networks. It is inserted into a 3G-compliant mobile phone to provide network authentication and additional functions. See SIM, smart card and 3G.

Universal Subscriber Identification Module Smart card used in a UMTS mobile phone carrying all subscriber-related information

UMTS subscriber identity module

See UIM. Verifier (or bytecode verifier) An application that processes incoming code (e.g., applets) and ensures that it complies with security policy. See also Java Card, PCC.