Before each shift, a chef in Charleston, SC vacuum seals his iPhone in plastic by running it through a CryoVac. Now the phone is safe from all water damage throughout his shift. The kicker? The phone remains fully functional.
The only thing that may take a hit after he "sous vides" (the process of vacuum-sealing a protein in a plastic bag and cooking it at in a consistently heated water bath, so not an entirely accurate way to describe it) is his phone, is actually using it as a phone. But a muffled conversation seems like a nice alternative to not destroying your phone.