EDIT 3/9/2024: I created a remix of my phone model to introduce a number of improvements. People reported the printed bolts breaking trying to tighten them sufficiently to hold the stand fixed in place. New model adds notches at the two key interfaces that take all of the load. The bolts serve to keep the pieces from sliding apart, but take very little load and require very little tightening.
I recommend using the updated model:
https://makerworld.com/en/models/242128#profileId-258073
Adjustable phone holder. Allows for the height and angle to be adjusted. Can also be collapsed or disassembled for easy transport.
Phone can be held horizontal or vertical.
Has access for charging cable out the bottom.
Prints without any support or brim.