Nice job OP! Not only is this not a stupid question, this is in fact a fantastic question! Kudos to you!
My phone goes in my left pocket, and I usually hold it with my left hand since I use a swipe keyboard to type, and I'm right handed. My front right is for my money clip, which also contains a few important plastic cards. This was a huge change for me. Keeping cash and cards and nothing else. Absolutely liberating to not have a wallet taking up pocket space.
My keys dangle at my right hip.
Context: I'm a man, and only wear shorts or pants with pockets. I also only buy phones that fit easily into my pockets, so never the extra mega ones.
I'm glad to see how many of us there are that have a system!