We all know someone who never carries a cell phone in the field because it gets in the way of a pure wilderness experience. Carry that logic far enough and pretty soon you’ll be free-soloing El Cap in the nude. I know, gross! Not me, but the hairy guy.
For the rest of us who carry phones for insurance, there are Aquapac cases. They allow great voice and picture quality through the clear plastic, have no loose parts and a lanyard and carabiner clip make them nearly fumble-proof.
Waterproof to 15 feet, they float and are simple to operate. It’s always a pleasure to find thoughtful designs like this. Weighs only an ounce; call it an ounce of prevention.