My iphone 3gs volume button is broken how can i fix it?

On my iphone 3gs the volume button is broken and i don't know how to fix it.everytime i try to turn the volume down i can't it will stay at the loudest and also the vibrate button doesn't work i mean i literally can't turn it on vibrate can someone please help me

Try going to the settings and set the volume and vibration settings.

If that doesn't work, it means that the button is spoilt and it could be affecting the phone function.

In that case, you will have to sent it for repairs.

Settings → Volume/Sound → Ringtone → Turn it down with FINGER