A mobile device for roaming between wireless communications networks in different geographical regions, the mobile device comprising a radio interface configured to receive network data over a wireless channel, said data relating to one or more of a plurality of access technologies available in a geographical region, a first store holding channel acquisition data relating to each of said plurality of access technologies for setting up a communication mode in a selected one of said access technologies, a second store holding a plurality of access technology selection parameters, and a multimode overlay function component configured to evaluate said data and select one of said access technologies based on at least one of said selection parameters.