Abstract: A mobile radio has a default mode of operation according to which the mobile radio is homed on a first wireless network in unique association on the first wireless network with a first-wireless-network identifier. The mobile radio receives, while operating in the default mode, a radio set of multiple second-wireless-network identifiers. The radio set is associated with a second wireless network, and each identifier in the radio set is reserved for use on the second wireless network by mobile radios that are not homed on the second wireless network. The mobile radio selects an identifier from the radio set and registers on the second wireless network using the selected identifier. The mobile radio operates in a migrating mode of operation according to which the mobile radio is homed on the second wireless network in unique association on the second wireless network with the selected identifier.

Abstract: A data interface interconnection gateway (DIIGW) is provided that interconnects to different wireless communication networks. The DIIGW implements methods for determining the network location of a mobile station from among the different wireless communication networks. The DIIGW communicates data link messages over standardized air interfaces in accordance with standardized air interface protocols using a data service that implements an acknowledgement mechanism. Depending on the implementation, the data service can be one of: a short data service (SDS), a TErrestrial Trunked RAdio (TETRA) high speed data service (TEDS), a TETRA packet data service, a short message service (SMS), general packet radio service (GPRS), a text messaging service or a wireless data link service. The DIIGW also implements at least one virtual mobile station that corresponds to a real mobile station that has migrated to a visited wireless communication network.

Abstract: A data interface interconnection gateway (DIIGW) is provided that interconnects to different wireless communication networks. The DIIGW implements methods for determining the network location of a mobile station from among the different wireless communication networks. The DIIGW communicates data link messages over standardized air interfaces in accordance with standardized air interface protocols using a data service that implements an acknowledgement mechanism. Depending on the implementation, the data service can be one of: a short data service (SDS), a TErrestrial Trunked RAdio (TETRA) high speed data service (TEDS), a TETRA packet data service, a short message service (SMS), general packet radio service (GPRS), a text messaging service or a wireless data link service. The DIIGW also implements at least one virtual mobile station that corresponds to a real mobile station that has migrated to a visited wireless communication network.