Abstract: A chip card for use in a terminal device assigned to a communications network, having at least one data field containing variable parameter data. To modify parameter data stored on the chip card, the chip card has an application, which is implemented on the chip card, in addition to the at least one data field containing variable parameter data, that the application is designed for generating and/or providing variable parameter data, and that an interface is provided between the application and the at least one data field containing variable parameter data. In addition, a terminal device having such a chip card is described, the terminal device additionally having an input application for generating parameter data for the chip card and for providing the generated parameter data in the application for generating and/or providing variable parameter data.

Abstract: The subject innovation relates to a subscriber identifier for subscriber authentication in a mobile telecommunications network. The subscriber identifier comprises a memory device that contains a first subscription data record for subscriber authentication in a first mobile telecommunications network. The memory device further contains a second subscription data record for subscriber authentication in a second mobile telecommunications network. Based on an available mobile telecommunications network, one of the contained subscription data records being usable for subscriber authentication in each case.

Abstract: The present invention in particular relates to a chip card (10) for use in a terminal device (20) that is assigned to a communications network, having at least one data field (11) containing variable parameter data (12). In order to be able to modify parameter data stored on the chip card (10), it is provided that the chip card (10) has an application (13), which is implemented on the chip card (10), in addition to the at least one data field (11) containing variable parameter data (12), that the application (13) is designed for generating and/or providing variable parameter data (12a), and that an interface (14) is provided between the application (13) and the at least one data field (11) containing variable parameter data (12).

Abstract: The subject innovation relates to a subscriber identifier for subscriber authentication in a mobile telecommunications network. The subscriber identifier comprises a memory device that contains a first subscription data record for subscriber authentication in a first mobile telecommunications network. The memory device further contains a second subscription data record for subscriber authentication in a second mobile telecommunications network. Based on an available mobile telecommunications network, one of the contained subscription data records being usable for subscriber authentication in each case.