This dashboard car phone holder only holds the phone in the horizontal position. It needs a smooth flat area(5 x 5.1 inches) on your dashboard for installation. Besides, it won't work well if your devices covered a thick case, especially the otterbox, life-proof and pop socket. Tear off the sticky film at the bottom of the car phone holder, make sure the surface of the car dashboard is flat, dry and clean (no dust), then place the holder on it. It will not leave any trace after removing. The bottom of the car phone holder is made of high-tech adhesive, which can be moved many times, just rinse it with water and dry it, and it will be like new.