Importance

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Abstract

A method for protecting a subscriber identity module in a mobile station. A network portion or network end is provided for establishing a radio communication network with mobile stations. A subscriber identity module is used to identify a mobile subscriber associated with a particular one of the mobile stations. When the particular one of the mobile stations is moved from an initial supply area to a new supply area, the particular one of the mobile stations is used to initiate updating of the management of the mobile station. Subsequently, subscriber data, associated with the particular one of the mobile stations, which is stored in a previously responsible subscriber database at the network portion is canceled. A radio paging message is transmitted from the network portion to mobile stations in the initial supply area. If at least one of the mobile stations in the initial supply area responds to the radio paging message and transmits a mobile subscriber identity, the network portion is used to evaluate the mobile subscriber identity that has been received from the at least one of the mobile stations. Evaluation of the received mobile subscriber identity automatically provides information about at least one further mobile station that is active without authorization and using the same subscriber identity module.

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First Claim