Water Damage

I was on a friend's boat and he'd loaned me his new drysuit so I could test it out. We were drinking a few beers and a bunch of us jumped in, me with the drysuit over my only clothes. One friend remarked that he had to go to the bathroom and I thought the same thing, then remember just in time that I was wearing a drysuit. I have similar concerns while wading in a stream when fishing and the water rises above my waist but is still safely beneath the level of my waders. I worry that my waders will leak and swamp my cell phone and make me look like I wet my pants, the only ones I have along and would have to wear for the ride home, which I'd be lucky to find without the map on my cell phone.