Mobile telephone connection transfer

Method for transferring an active connection between a mobile telephone handset and a first mobile telephone system to a second mobile telephone system, which method includes the steps of: (a) detecting that signal strength of the active connection has fallen below a predetermined threshold; (b) sending a request to the first mobile telephone system to set up an alternative connection from the first mobile telephone system to the mobile telephone handset through the second mobile telephone system; and (c) transferring the active connection to the alternate connection.