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The Committee is responsible for the definition of the Smart Card Platform, the UICC. ETSI technical committee smart card platform (SCP) The group is responsible for the standardization of the USIM/SIM for applications on top of the Smart Card Platform, the UICC specified by ETSI TC SCP. Technical Specifications Group, 'Core Network and Terminals' Working Group 6 (CT WG6) is responsible for the specifications of Smart Card-based network authentication applications such as the Subscriber Identity Module (SIM) which is used by 2G systems, the USIM (Universal Subscriber Identity Module) which is used by 3GPP™ systems (from 3G to 5G), the ISIM (IM Services Identity Module) for authenticating to IMS and the HPSIM (Hosting Party Subscription Identity Module) with the exception of the security algorithms (developed by 3GPP™ Systems Aspects (SA) WG3). USIM standardization is concentrated in two committees: 3GPP-CT6 The ETSI work on Smart Cards, amely the evolvement of the functionality of the UICC, which is the basic platform for the USIM has evolved the USIM card, towards allowing contact-less data flow for Identity, Security and Payment applications. It also provides a means to authenticate the user and may also store other subscriber-related information or applications. The primary function of the USIM is to authenticate the validity of a terminal when accessing the network. When the SIM is placed in a terminal or handset, users can register onto a network. The USIM used in Digital Cellular Telecommunications Systems like from GSM over 3G, 4G now to 5G is the entity that contains the identity of the subscriber. The SIM Card has developed in to the 'Smart Card' with a growing variety of applications and features. There are several billions of USIM cards sold every year in the world and no sign of a slowdown in the demand for them. In terms of 'sales' the (Subscriber Identity Module) SIM or better the USIM, how it is called since 3G, must rank as ETSI's most successful standard.