Patent ID: 8032140

Claim:
A handover warning method for wireless communication devices in a call, comprising the steps of: providing a wireless communication device and a warning system installed in the wireless communication device; setting a base station of a network in a service area and sending data of the service area in a predetermined frequency, the data of the service area including cell broadcast, cell identification and a sending frequency of the base station; actuating the wireless communication device in the service area; locating the wireless communication device; using the wireless communication device to call; and when the wireless communicating device enters a new service area during the call, outputting an alerting signal with the warning system during the call and continuing the call without interruption until the call ends, including these substeps: receiving a handover command sent by a new base station of a new network in the new service area; switching the wireless communication device to receive data sent by the new base station according to the handover command; alerting the calling user that the wireless communication device has entered the new service area; searching data of the new base station, and continuing the call when data of the new base station cannot be found; locating the wireless communication device according to the data of the new base station when data has been found; and updating the stored data.