Wireless communication apparatus

A mobile communication device is disclosed, and is modularized to include an electronic device for performing mobile communication and a frame assembly. The frame assembly comprises a circuit board having an electrical connection interface and a frame having a recess for receiving the electronic device. In addition, a first electrical connector is disposed on a side wall of the recess, and the electronic device has a second electrical connector connected to the first electrical connector, such that the electronic device coupled to the circuit board via the forgoing two electrical connectors. By inserting the mobile communication device into an accommodation space in a casing of a host electronic device, the electrical connection interface is inserted into an electrical slot that is arranged in a printed circuit board in the casing, thereby achieving a function expansion of mobile communication for the host electronic device.