A telecommunications system communicates data packets to and from a mobile terminal in accordance with a mobile internet protocol. The system includes a packet radio network having a first radio access interface and a gateway support node and includes a wireless access network having a second radio access interface and a home agent. The mobile terminal is arranged to connect to one of the packet radio network or the wireless access network and, when connected, to detect which of the packet radio network and the wireless access network the mobile terminal has connected. Upon detection that the mobile terminal is attached to the packet radio network, the mobile terminal and the home agent are arranged so that data packets are transmitted to and from the mobile terminal via the gateway support node in preference to the home agent.