I'm American and I never understood the back-pocket thing until I moved to the West Coast and started carrying my (bulky, remote) car key in addition to just house keys. Once you have those and a phone in your front pockets, something has to go in your back pocket.
Born and raised in Cali. I've always had keys in my right, phone in my left, wallet in back right.
I remember before I even had a cell phone myself and people in general still put their wallets in the back right, and it was cool to have a chain attached to it and hooked to your front right belt loop. I'd use my front pockets for all sorts of random crap, but I think I always had my keys in my front right. I've been really good about virtually never having lost a key in my life. I used to carry a pocket watch in my left.
Now I am faced with a pocket dilemma. I carry one phone for data and a 5s that I am using with a SIM (connected via pdanet/foxfi hotspot). So the two phones are taking up both front pockets! I'm currently either putting my keys in my jacket or in my back left pocket, which can potentially be quite uncomfortable to sit on. Would be cool if there was an easy way to flatten keys like a wallet.
