My baby nephew put a cell phone into a full coffee cup once! The phone wasn't very efficient after that!
The same thing would happen to any cell phone if you dropped it into a pool or into the sea! -which happens a lot!-
But Sony Ericsson have come up with a great solution for such bloopers!

Meet the SO902iWP+ , it is a waterproof cell phone, that even comes with waterproof headphones / earphones! It also comes with an mp3 player and 1.3 megapixel camera.
The strangest thing is that it can receive calls under water, but how can you answer a phone while you're down deep?