You never thought something larger would be harder to fall out because it fills the pocket more? Mine hasn't fallen out but my pockets are pretty deep(UA shorts). But lately I've been leaving the phone in my locker and have Jay bird blue bud x that work throughout the whole gym.
The item in question is too big for his medium to small sized shorts with small pockets. A bigger phone isn't going to fill out a small pocket more. I could see if we were talking jeans or something else, but not the way gym short pockets are made.
My comment was mostly sarcasm in regards to first world problems. I'm more interested in learning how big your gym is where bluetooth headphones work all the way from the lockerroom. Must be small?