A foldable cellular phone includes a first housing, a first protruding portion, a second housing, and a second protruding portion. The first housing includes a first hinge part, the first protruding portion being disposed on the first hinge part. The second housing includes a second hinge part, the second protruding portion being disposed in the second hinge part. The first hinge part and the second hinge part couple with each other as a hinge. When the second housing rotates around the hinge relatively to the first housing, the second protruding portion corresponding to the first protruding portion is capable of acting as a stopper to stop the movement of the first protruding portion. Subsequently, the second housing is in a flip position with a predetermined maximum angle.