It would be some sort of defense department modified model at best. Truth be told, they all will leak AFAIK.
Finding waterproof cases is another issue. Consult with a professional diving supply shop (*not* a ghetto/surfer dude place, but a yuppy store) for more specifics.
I'm looking for a truly waterproof cellphone, and by waterproof i don't mean 1 meter 30min i mean i can throw it in the ocean and it washes up later and i can use it.
And before you suggest it i have had a Moto Tundra (although no one would suggest it at this point since they don't make them any mare) and a Sonim 3300 which are both Milspec and "IP-68 SUBMERSIBLE TO 2 METERS FOR 1 HOUR IN WATER" BTW the Tundra isn't dog proof and the 2 3300s I've had aren't water for 2 inches for 60 seconds.