I really liked the original design by @juniortan but I don't have a 1mm pin laying around so I modded it so that a 1.75mm filament can be used as the hinge pin.
I also made the phone hook a little wider to make room for the rubber case around my phone and leaned out the rest of the stand a bit and arranged both parts to print as a single print.

Modded with tinkerCAD: https://tinkercad.com/things/429eu3MDrka-iphone-folding-stand