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Any other suggestions?
RobRenz's suggestion for getting a better grip on your knob should work just as well on a phone case.
https://www.youtube.com/watch?v=JU2jsbGNcZE
gbj_tester
My phone has a nice, glossy, metal back which looks good but in reality means it's bloody slippy and awkward to use with one hand.
I could get a case but prefer to keep it as small as possible and cases all seem to add a fair bit of bulk. Any suggestions for some tape or similar that could be stuck on the back to fix this. I looked at skateboard griptape but that was too rough. Any other suggestions?