Abstract: Disclosed herein is a construction of a mobile device. The mobile device comprises a display unit 1 to display phone call information and various other kinds of communication information, and a main body to which the display unit is coupled. The display unit comprises display windows disposed on front and rear sides of the display unit with a circuit board interposed therebetween, and sliders protruding from both sides at a leading end of the display unit in a longitudinal direction. The main body has a bottom wall, and sidewalls extending upwardly from two or three edges of the bottom wall to define a coupling recess at the central region of the main body such that the display unit is seated in and coupled to the coupling recess.