MOXOM MX-VS200 Magnetic Phone Holder

A magnetic pad on a ball joint and a weighted base: the phone snaps on, turns to either orientation and tilts to whatever angle you were going to hold it at anyway.

Zinc alloy rather than plastic, which is what stops a magnetic holder sliding when the phone goes on one-handed. MOXOM sell it for a desk, a kitchen counter or a car equally. A hundred in stock at thirteen dollars.