yeah, ive already had to replace one iphone because of water damage, and mine was in the water for a half a second (i grabbed it immediately) and they can tell if water has gotten to it, and wont replace it...
the second time i bought a iphone dude was like 'these phones are not waterproof,everyone thinks they are but they arent so dont go swimming with it'
now i get what he meant, i was like no shit they arent waterproof and he was all youd be suprised