There are times I want to mount my phone to a variety of surfaces, ie windshield, desk stand, tripod, etc. I found a cheap alternative to those fancy clamps is to just use self adhesive hook & loop strips on the back of my polymer phone protector.

For my tripod mount, I printed this simple bracket to affix the hook strip. The dovetail mount is designed for a Manfrotto tripod, but I think it might work for a variety of manufacturers.

The bracket is tall enough to accomodate the phone in both the vertical and horizontal positions.