A subscriber identity module for authenticating a subscriber on a communication network includes: a first set of subscriber identity data for authenticating the subscriber; a second set of subscriber identity data for authenticating the subscriber, with the first set of subscriber identity data differing from the second set of subscriber identity data; and a means for managing the first and second sets of subscriber identity data, with the managing being realized by management functions. The subscriber identity module can be extended to a method for managing the subscriber identity module, to a use of the subscriber identity module in a mobile end device, and to a system comprising subscriber end devices and a remote entity.