The SIM, which played a central role in the success of GSM, is also part of 3G in a new guise - the USIM or Universal SIM. This carries out the same functions as its 2G cousin such as authenticating the user on the network and securing access to the network services but also acts as a means of ensuring continuity of services when migrating to 3G and also enabling the new range of a data services on offer. This paper explains the essential role of the smart card for both operators and subscribers.
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