I used to put a small box under the foot but then phone wouldn't stay in one place while typing numbers in it so I had enough and designed a new foot for the phone. Yes, I'm calling it a foot. No idea how to better describe this :)
I used Fusion 360, if you want to play, I've attached the original file as well. The leg is extended by about 20 mm.
Hint: use 0,2 mm layer height, 5 perimeters and (tree) supports for the 2 upper clips.
The author marked this model as their own original creation.