Subscriber identifier and method for subscriber authentication

摘要

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.