Phone dropped in Water

About a month on so ago, my samsung P207 phone dropped in a tub of water. I was able to immediately take it apart and dry it, but about a week later, the keypad stopped working. I am able to turn my phone on using the keypad, but thats it. Everything else works perfectly. But i can only hang up wen i close the phone, i cant do nething on my phone except receive incoming calls. I am unable to check my texts or anything else that invoves using the keypad. Please Help!!