Patent ID: 7187923

Claim:
A method for use by a mobile communication device in switching a voice call between two different wireless communication networks, the method comprising the steps of: maintaining voice communications for a voice call with a communication terminal through call control equipment, the voice call involving a traffic channel established between a first wireless network and the mobile device with use of a first transceiver portion which operates in accordance with the first wireless network; in response to identifying a predetermined condition, causing a message to be transmitted to the call control equipment for establishing a connecting call between the call control equipment and the mobile device, the connecting call involving a traffic channel established between a second wireless network and the mobile device using a second transceiver portion which operates in accordance with the second wireless network, the connecting call being made part of a conference call connection established at the call control equipment together with the voice call; and maintaining voice communications for the voice call over the traffic channel established between the second wireless network and the mobile device.