MOXOM MX-VS185 Waterproof Motorcycle Mirror Phone Holder

A sealed case rather than a clamp, which is the whole point on a motorcycle: the phone sits behind a clear touch-through window that keeps rain, road spray and grit off it, and you still get to use the screen through the cover.

It bolts to the rearview mirror stem, so there is nothing on the handlebars and nothing in the way of the controls. A multi-directional ball head takes the full 360 degrees, so the phone turns to whatever angle reads best at a stop.