US Patent 7970434 Dual-mode phone and calling method

A dual-mode phone includes a mobile phone antenna, a mobile phone module, a WLAN antenna, a WLAN module, a processing module, a memory, and a user interface. The processing module sets a communication mode of the dual-mode phone. The memory stores the communication mode and a phone book, wherein the phone book includes a plurality of mobile phone numbers, a plurality of WLAN phone addresses, mapping relationships between the plurality of mobile phone numbers and the plurality of WLAN phone addresses, and statuses of dual-mode phones corresponding to the plurality of WLAN phone addresses. The user interface receives an input phone number. The processing module further determines if the input phone number is a mobile phone number, determines if the mobile phone number has a mapping WLAN phone address, and calls the mapping WLAN phone address via the WLAN module.