A mobile phone device includes: a mobile phone body circuit board, which is provided with slots of a predetermined interface, and modular wireless processing modules with different network standards, which are provided with pins of the predetermined interface; when one network standard is used, the pins of the modular wireless processing module utilizing the network standard are plugged into the slots of the mobile phone body circuit board, and the communications between the circuit board and the modular wireless processing module are carried out by the predetermined interface; when the network standard is changed, the modular wireless processing module corresponding to other network standards is plugged instead into the slots of the predetermined interface in the mobile phone body circuit board. Users can change the different network standards, simply, easily and quickly, and the cost that manufacturers design mobile phones and users change networks is reduced.