"Liquid is like Kryptonite for the iPhone. It comes in all forms and especially here in Seattle, in the form of rain. (Not to mention coffee.) If you ever take your iPhone into the Genius Bar at your local Apple store, the very first thing they'll do is shine a little light into the phone to check for liquid damage. If they see it, they say, "Sorry, it's out of warranty." Liquid damage is the main cause of a voided warranty. "