A method of communication over a cellular telecommunications network using an electronic device comprises communicating a session control signal between the electronic device and the cellular telecommunications network on a first radio channel provided by the cellular telecommunications network. The session control signal comprises identification data that identifies a remote party. The cellular telecommunications network uses the identification data to establish an IP-based communication session with the remote party. Content data for the IP-based communication session is communicated between the electronic device and the cellular telecommunications network on a second radio channel provided by the cellular telecommunications network.