I have a problem with Iphone 4s sound?

I dropped it in water and media volume is broken
When someone calls me i can hear the ringtone. I try to increase the volume using the buttons there are no blocks under the volume sign, and it just won't increase. Adjust ringer volume with bottons is enabled. I try to clean the headphones jack but nothing happened.
Check this: /

I think iPhone give replesment voranty so you don't have waryy about it go and replace your phone if your phone in warty