I live in an open carry (cellphone) state as well, in the pocket without any external protector scratches the phones up significantly. Put a protector on it and then it is too bulky and too slow to answer. My front pockets hold change and keys. Back pocket holds wallet. I don't think the cell phone would last long in a back pocket.
Am I a nerd for also carrying my leatherman tool in a cordura holster on my belt?
My cell stays in my car because it does'nt work inside my office and I don't use it at home. If I go inside a store or get out of my car to a restaurant, etc, it clips on my belt.
As for the original post question, there are probably at least hundred different configurations, makes and models of cellphone holders. I made my own because I got tired of the cheap plastic clips breaking and put a larger steel clip on a cordura pouch similar to the one from wrbsales
Cell Phone Pouches