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The Universal Mobile Telecommunications System is one of the 3rd generation mobile phone technologies that allow a higher data rate than GSM does. Originally UMTS was standardised by ETSI but today it is supported by 3GPP.
The UMTS SIM Application Toolkit (USAT) is based on SAT but is enhanced for the features provided by the UMTS technology. It enables the USIM to drive the UMTS handset and enables an interactive exchange between a network application and the user. The USAT function is located on the USIM card.
A Universal Subscriber Identity Module (USIM) stores subscriber information, UMTS authentication information and provides storage space for text messages and phone book contacts.