Patent ID: 7460856

Claim:
A method of switching access for a mobile terminal between a first mobile network and a second different mobile network, the mobile terminal comprising a first radio device and a second radio device capable of communication with the first and second mobile networks, respectively, wherein the first and second radio devices are interconnected by a communications link and the second mobile network has priority over the first mobile network, the method comprising: A) making an access request to the first mobile network by the mobile terminal using the first radio device, B) authorizing and establishing a first connection between the first radio device in the mobile terminal and the first mobile network, C) when the mobile terminal is detected as present in a coverage area of the second mobile network, the first radio device of the mobile terminal receiving authentication information from an authentication unit in the first mobile network, wherein the received authentication information includes one or more encryption keys and log-in information from the authentication unit, and D) authorizing and establishing a second connection between the second radio device in the mobile terminal and the second mobile network based on the authorizing step B) for the first connection with the first mobile network, wherein the second radio device uses said one or more encryption keys to establish the second connection and to protect payload data communicated over the second connection, and wherein the first mobile network has a predetermined authentication agreement with the second mobile network so that the authentication information and encryption keys are already known in the second network prior to authorizing and establishing the second connection.