I have next to nothing in the boob area so I've never been able to store my phone in there. However, after the endless struggle of finding a comfortable holder, I found this (sorry, on mobile): http://www.amazon.com/dp/B00M1BCDTW/ref=cm_sw_r_udp_awd_H39hvb18PVNMP

Instead of putting it on my hips, I tighten it around but midsection and it's great to hold my phone (Galaxy S4 in defender otterbox) and has a second pocket that I can put keys, chapstick, granola bars. . Basically anything in because the pockets are huge.

I LOVE it and totally recommend it. Sorry this now sounds like an advertisement!