S3650 Corby / S3650 Genio Touch Cell Phone: it felt into a bucket full of water...

First of all, do not turn it on, you could make more damage. Next, take out the battery, and completely dry the phone before trying to use again.
Here is the procedure to take out all moisture trapped in the phone: Dry the phone, battery, any accessory, etc. with cloth and wrap each piece, phone and accessories, in newspaper. Place a few handfuls of rice into a plastic bag and then place the wrapped phone in the bag with rice. The newspaper wrapping avoids direct contact of rice with your phone because the dust from the rice can get into the small areas of the phone. The newspaper and rice will absorb moisture. Leave it there (with the bag open) at least 24 hrs.