I did the same thing last year!!!!! I dried it out (took the back off etc) for a while and it has been working since.....the only thing is you can't dial a 4, 5 or 6. I have no idea why?????
So, I had people call me so I could save their number to my phone...it dials it fine in memory, you just cant hit the button and have it register.
It actually has been about 9 months now too....