A mobile phone includes a main body consisting of front and rear side parts; a retention groove formed in the rear side part and having pivotal holes; and a prop kept within the retention groove in the rear side part. The prop has two positioning posts pivotally inserted into the pivotal holes in the rear side part. The prop is turnable relative to the rear side part between a normal position where the prop is pressed into the retention groove, and an extended position where the prop is spaced apart from the rear side part to form an angle. Movement of the prop between the normal position and the extended position results in engagement between the positioning posts and the pivotal holes so as to permit leaning of the main body on the prop.