Wet iphone 3GS and now won't stay off.

Sounds like you have some bridging activation of the 30 pin connection port (it thinks it's being plugged-in). Clean/dry the port with any of the many ways previously described in MacRumors.

 

Put it in rice anyway and let it run out of power on its own.

 

Happened to me. I just put it in the airing cupboard for a few hours and it was fine.

~Callum

 

I've had two iPhones (3G/3GS) get completely submerged in liquid. Both came back up fine after they had ample time to dry. Placing it in a ziplock bag full of rice worked fine for me but took about a week to fully dry out. Opening the phone and blow drying it also worked, but this is not for the faint of heart. YMMV

 

Wet Iphone-

Put the phone in a container with dry rice and silica- will dry out in 24-36 hours. Mine got wet Thurs night- packed it in rice immediately, added silica Friday night- was dry and fully operational Sat morning- no lost data. Good luck.

PS- You can get silica at a craft store- used to dry flowers........just be sure to keep it away from pets.