Abstract: A method for providing an emergency functionality when setting up a call directed to a User Equipment in a public land mobile network, the public land mobile network having a home database and a visitor database, includes, in case of the occurrence of a mobile terminating call towards the User Equipment: requesting, by a requesting entity, that the home database provide information specific to the User Equipment to the requesting entity; and in case of a failure of the functionality of the home database, requesting, by the requesting entity, that the visitor database provide the information specific to the User Equipment.

Abstract: The invention relates to a method for establishing a radio link between a non-authorized mobile radio terminal (B) and a base station (C) of a mobile radio network (D). According to the invention, an authorization is given to the mobile radio terminal (B) in order to use the base station (C) as access to the mobile radio network (D), said mobile radio terminal (B) can be authorized at least temporarily, in particular manually, and the base station (C) transmits a corresponding release notice to the mobile radio terminal (B), and a radio link between the mobile radio terminal (B) and the base station (C) of the mobile radio network (D) is established.

Abstract: A method for providing an emergency functionality when setting up a call directed to a User Equipment in a public land mobile network, the public land mobile network having a home database and a visitor database, includes, in case of the occurrence of a mobile terminating call towards the User Equipment: requesting, by a requesting entity, that the home database provide information specific to the User Equipment to the requesting entity; and in case of a failure of the functionality of the home database, requesting, by the requesting entity, that the visitor database provide the information specific to the User Equipment.

Abstract: The invention relates to a method for blocking roaming steering mechanisms. According to said method, a foreign cellular device (3), e.g. a cellular telephone, is registered with nationally visited radio network (2) when the foreign (1) and the national cellular network operator have concluded a roaming agreement on mutually debiting cellular services. The invention is characterized in that an anti-roaming steering server (5) installed in the nationally visited cellular network (2) identifies manipulated error messages (14) and selectively manipulates the registration process (8) of foreign mobile users by adequately influencing signaling processes.

Abstract: The invention relates to a method for establishing a radio link between a non-authorised mobile radio terminal (B) and a base station (C) of a mobile radio network (D). According to the invention, an authorisation is given to the mobile radio terminal (B) in order to use the base station (C) as access to the mobile radio network (D), said mobile radio terminal (B) can be authorised at least temporarily, in particular manually, and the base station (C) transmits a corresponding release notice to the mobile radio terminal (B), and a radio link between the mobile radio terminal (B) and the base station (C) of the mobile radio network (D) is established.

Abstract: The invention relates to a method for blocking roaming steering mechanisms. According to said method, a foreign cellular device (3), e.g. a cellular telephone, is registered with nationally visited radio network (2) when the foreign (1) and the national cellular network operator have concluded a roaming agreement on mutually debiting cellular services. The invention is characterized in that an anti-roaming steering server (5) installed in the nationally visited cellular network (2) identifies manipulated error messages (14) and selectively manipulates the registration process (8) of foreign mobile users by adequately influencing signaling processes.