A wireless communication device (100) includes a receiving module (11), a storage module (12), a processing module (13) and a warning module (14). The receiving module receives data sent by a base station of a network communicating with the wireless communication device. The storage module is electronically connected to the receiving module, and stores the received data. The processing module is electronically connected to the receiving module and the storage module, and processes the received data. The warning module is electronically connected to the processing module, and outputs an alerting signal in accordance with the processing result of the processing module if the wireless communication device is actuated during a call and the base station of the network communicating with the wireless communication device is switched from one to another.