Smartphone Stand

I was looking for a very simple smartphone holder that I could use to film myself while bouldering. I liked the idea of the "Mini Smartphone Stand gen. 2" but it was not working with my phone. The hole was to wide and the phone to large so it always tipped over. I redesinged the holder so that it can hold my phone securely (it is a bit wider and quite a bit longer). I also added more grooves with different angels so I have more options when positioning it.

Should be compatible with phones with a thickness of about 9mm. I am useing it with a Samsung S8+.