Just make a belt loop like this, to fix a sporting phone belt-holder on the bicycle. Put a small spongle in betveen. For better fix and amortization.
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Step 1: How to Make a Short Loop.
Then fix the rest of the belt loop by rubber peace of camera
Step 2: & on Backpack
can be used the same loop. Then phone is in very good place for call answering and talking in hands free mode.