Hunh. I've always put my phone in my pocket bottom down. Could that be driven by where the headphone connector is rather than the other way 'round?
Could be I guess, but when I'm using the phone I usually have it upright, so it is a natural motion to put it in my pocket top down. To put it in my pocket bottom first I have to physically rotate the phone to do so. Thought I read once that Samsung had done market use studies on this, but not sure now.