Try propping it up in front of a fan. You still get the flow of air to dry, but without the heat. No, I don't have experience with a fan, but it seems very logical to me. I used rice when I needed it and it worked after that.
p.s. Don't take my next piece of advice too lightly. If you really believe that there is Someone Above who commands all, ...then daven, as well.
Only He will decide if your phone can be resurrected or not.