The polymer pad securely grips the phone. I've used this for many years, and I'm still impressed with how it works. When the pad gets dirty, wash it under a tap, and it's as good as new.
https://www.youtube.com/watch?v=q_-IxDLPCrI
GripGo Car Phone Holder (Greenstead CO4)
This offer has been gifted to someone and is no longer available.