The disclosed portable phone with changeable housing uses a battery pack as a control mechanism for changing the housing and includes a front housing, a rear housing, a printed circuit board and a battery pack. A battery place area is formed at the back surface of the rear housing, and a plurality of protruding ribs are formed at the periphery of the battery pack. During assembly of the portable phone, the printed circuit board is electrically attached to the front surface of the rear housing, and the primary hooks at the flange of the back surface of the front housing are inserted through the associated primary openings at the rim of the front surface of the front housing, so as to form a plurality of battery caves at the sidewalls of the battery place area. Then, the battery pack is situated in the battery place area, and the protruding ribs are engaged with the associated battery caves. When the user desires to change the front housing, the user first removes the battery pack from the battery place area, to separate the front housing and rear housing.