Cell phones that are carried inside pouches or holsters are always exactly where they are supposed to be at the exact moment that they are needed. A pouch that clips to a pantsline or loops onto a belt ensures that the phone is always close at hand, never in a mystery location. The same cannot be said of carrying a cell phone around in some type of bag or purse. By the time you actually find your cell phone, the caller has already started leaving you a voice message.
Toting a cell phone around in a pocket used to seem like a pretty good idea, but that was before smartphones like the Samsung Galaxy SIII reached gargantuan proportions. Placing one of these large cell phones inside a pocket is impractical unless you don't mind the phone digging into your leg when you sit down