Yeah, I'm not clipping things to my air vents. Reminds me of my grandmother clipping air fresheners to her car. Ha! Nor am I going to mount my phone up there're where the sun will beat down on it (and here in AZ, that's an issue).
Sorry, but nothing out there on the market compares to the Steelie:
Solid steel, interchangeable, a breeze to remove, and nothing to have to "keep in your pocket". Best of all, you can mount them anywhere!
I bought these... Love them and they look cool mounted in the car. Even bought my hubby one for his Rover, and another he's mounted in the garage on the wall by his workbench where he hangs his iPad while he's puttering around out there.
The product is fairly new. And I see they have recently added even more products. So,
if you're absolutely wanting to put a cell phone on your vent, they have theses too:
They even make a holder for you cyclists out there.