I always have trouble storing my smartphone in the pockets of my jeans or shirt. It is almost necessary to wear some kind of jacket to safely carry my phone. Here is a solution I think works. A phonepouch on your belt. This one is made of some old T shirt scraps and a bike innertube.
second photograph shows a revised edition, witch looks a lot "cleaner".
More photo's and remarks on several steps marked: "extra-extra, second edition"
Step 1: You will need
A sewing machine
old t-shirt or other crap of soft textile
piece of hook and loop