Grip Go 

GripGo has a strong suction base that holds on tight, no matter how difficult the top is that you're operating on. The Grip Go telephone mount also does not depend on adhesives that may keep sweaty deposit around your product, or allow it to be difficult to remove from the mount.
Source(S): http://www.yourenotstupid.com/review-of-the-gripgo-hands-free-phone-mount/