Disclosed is a mobile communication device. The mobile communication device includes a first body section having a keypad arranged on a first upper surface thereof; and a second body section connected to the first body section and having a display screen arranged on an upper surface thereof, the second body section linearly sliding from a first position where the second body section overlays the first body section to a second position where the second body section exposes a first part of the keypad, the first part providing input functions of numerals and letters, the second body section rotating while facing the first upper surface from the first position to a third position where the second body section fully exposes the keypad. The communications device can selectively provide QWERTY keyboard arrangement, thereby allowing increasingly integrated electronics and complex features sufficiently utilized and long text messages easily edited.