Handover between heterogeneous radio networks including out of tunnel handover message transmitted directly to an information server

Disclosed is a method of performing a handover of a mobile device 201 from a first wireless network to a second wireless network, the mobile device being operably connected, via a tunnel 231, to a Server of a Mobile IP system 230, and to an information server 210 coupled to the first and second wireless networks, wherein the information server 210 is arranged to provide handover messages to the mobile device to assist the mobile device in performing a handover from the first wireless network to the second wireless network, comprising the steps of :the mobile device transmitting a handover data packet to the information server via the tunnel; and the mobile device transmitting a handover data packet to the information server via another route 233. The other route may be a direct transmission of handover packet data to the direct IP address of the information server.