My s21 ultra case is quite thick and fits in zips due to the thickness of the middle plastic case. So I used a pair of pliers and folded back the prongs on the 3 metal fasteners so they rotate. Now when I put my thick case on the bottom clasp, the top ones tighten around the case and hold it in place. Hope this helps others with fat phones. Ps I had a magnetic phone holder f30 but my problem was the phone kept falling so this solution is better for me.
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