I had a phone holder which was by Osomount and rather than sticking to the dash or windscreen purely by suction it had a sticky circular mount that was VERY sticky and did indeed adhere really well.

In order to renew its stickyness you just had to wash it in plain water and it did become much stickier, I can really recommend this type of holder, I had one by another brand that I got on Amazon and it had the same sticky mounting and was just as good.