Preventing misuse of a copied subscriber identity in a mobile communication system

Abstract

The invention relates to a method and an equipment of preventing the misuse of a copied subscriber identity in a mobile communication system. The use of a subscriber identity is restricted to predetermined terminals, each having an associated equipment identity in such a way that: a number of allowable equipment identities is defined for at least one subscriber identity, and a data base linking said subscriber identities and the equipment identities allowable to them is created; the terminal sends the terminal user subscriber identity and its dedicated equipment identity to the rest of the system; the rest of the system compares whether the equipment identity sent is allowable to the subscriber identity sent; as a response to the equipment identity sent being allowable to the subscriber identity sent, the use of the terminal is permitted, and otherwise the use is denied.

Dependencies are inferred from the claim text.