Adjustable Cell Phone Tripod Mount

Not great, but it does what I need it to. It'll hold a phone as small as an iPhone 5 or SE with no case and as big as an iPhone 6 with a thin case. You'll also want to be sure not to over tighten the plastic bolt. You have more than enough strength to shear it off.

You will need to add a 1/4" - 20 nut to attach to your tripod.