Portable telephone set

A portable telephone, which means additional function unit, such as a flip-slide means and can be easily mounted on the housing comprises only the basic components required for basic call unit, the additional function unit to provide additional functionality to the portable telephone main body. As an additional function unit of the liquid crystal display of the front cover of the front cover 40, flap 50, a keypad panel 60, the grip portion 70, a keypad or a plurality of the slide 80 and a slide 90 mounted on the base unit 20. Therefore, this structure can meet the user wishes to change his or her mobile phone to purchase his or her favorite form of need.