i accidentally dopped my iphone 3gs in a sewage system :oand when i was able to recover it, it was soaking wet, covered with black mud and shut off.
good thing i've read one email regarding the use of rice grains to dry water damaged cellphones.
without other option in mind,

i immediately cleaned the outside of my iphone with damp cloth and immediately removed the sim card and let the sim slot opened (since other parts cannot be easily removed and i was really in hurry that time), and soaked my iphone in one bowl full of dry rice grains.
based on the email, i should let it there for 2 to 3 days so the moisture can be totally absorbed by the rice grains. I opted to let my iphone soaked in rice grains for 5 days.
and so, after days with much anticipation and fear of losing my newly bought iphone, i turned it on and yes! it worked!

thanks for the rice method..
hint: never try to turn on your iphone if you're not sure that it is already fry; that can cause short circuit on the battery and other components and thus totally damage your iphone.