Patent ID: 6957060

Claim:
More than one mobile station for use in a cellular mobile radio network, said cellular mobile radio network being configured to require a mobile station to include a SIM card to connect it, each mobile station comprising (a) a SIM card reader for receiving a SIM card, (b) mobile authentication means arranged to interact with the network to set up a call via the network, and (c) an identity database arranged to hold default identity data, the mobile authentication means being arranged to access the identity database in the absence of a SIM card in order to obtain identity information to use during interaction with the same communications network during call set up, each mobile station having different respective default identity data which permits the network to distinguish between mobile stations when authentication occurs in the absence of a SIM card wherein the network provides limited functionality to the mobile station as a consequence of the use of the default information during call set up, the functionality being limited to the setting up of calls to a predetermined number.