my iphone speakers wont work no volume bar shows when i turn up/down the volume when i go to the settings it works though...

If you're jailbroken and use cydia tweaks: you may have installed a bad tweak that has remapped the keys.
Otherwise your volume buttons are broken and the volume buttons'board needs to be replaced.

no i posted this for my sister she not jail broken
edit: she says it has water damage
Then it's more than likely that water has gotten between the logicboard and volume button board's ZIF connector, on the 4/4S replacing this part is relatively easy and going to a specialist you should be able to get it done for $35~40, But that's assuming there are no other faults now, Apple will fix the whole thing for around $150/more as I'm not sure what their current repair price in the US is.
Good luck.