Been wanting to mount my iphone so I can use my GPS.
I use an app called Waze, which besides showing 3d maps and directions, also shows real time road hazards, and keeps track of the sneaky cops and their speed traps.
Anyway the mounting options are pretty expensive and imho only questionably secure.
So....
I bought a cheap but good phone case and JB Welded a couple of 1/4 20 nuts to it. But only after a proper prep of course... (heavy scratches and degreaser)
And... a $5 mini tripod camera mount. (make sure to get one with a steel ball & socket)
The legs come right off and the hose clamp screws right on. Easy!
Less than $20 and less than 15 minutes of work.