May the salt from your sweat has corroded something? When I ride I don't keep anything in my jersey pockets. I usually keep everything in a fanny pack. Helps keep the sweat off of things and doesn't bounce around. I took a pretty hard fall a few years ago and everything in my jersey pockets were ruined (and my back pretty bruised). Fanny pack carry keeps me a bit more cushioned. I also bought a cheap phone ($30) and switch out SIMS before I head out. I don't need to be checking emails when on a ride