This is a very simple phone holder that can be used on any tripod with an Arca-Swiss compatible clamp.
There are already a lot of holders of this type, none of them matching my phone or mount, so a made a parametric one!
The uploaded STL and STEP files are sized for an iPhone SE with a protective cover, but you can download the original file from the Fusion 360 Hub (http://a360.co/2rY0r0r) and adapt the size in the parameter sheet