RUBBING ALCOHOL!!! Pour rubbing alcohol all over your phone to wash all the water out of it. Water does two things to electronics that causes problems, one is that water is an oxidizer and just letting the phone dry will cause internal parts to oxidize and shorten the life span on them. Also water is laden with other particles, whether it be iron, salt, silicas,and they will all be left behind when the water evaporates, and they can cause the short circuit after the phone has dried out. So if you rinse all the water out with pure rubbing alcohol and then let it dry the phone will be fine 95%of the time, granted you didn't turn it on when you got out of the pool.