Patent ID: 7359704

Claim:
A method for migrating a communications device from a first wireless communications network operating on a first standard to a second wireless communications network operating on a second standard, the communications device being assigned a mobile station identification number (MSIN), the method comprising: transferring a subscriber profile associated with the communications device from the first communications network to the second communications network, and associating the transferred subscriber profile to a subscriber identifier usable by the second communications network; associating the assigned MSIN with a block identifier that identifies the communications device as a member of a group of subscribers that is to be migrated to the second communications network: receiving a registration request from the communications device, the registration request including the block identifier and the MSIN; detecting the block identifier; and if the registration request is received in the first communications network: in response to detecting the block identifier, associating the MSIN with an interworking and interoperability function (IIF) and routing the registration request to the IIF.