Headset; Change The Volume - Nokia LUMIA 800 User Manual

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Unlock the keys and screen
Press the power key, and drag the lock screen up.
Set the keys and screen to lock automatically
Select and lock+wallpaper Screen times out after, and select the length
> >
of time after which the keys and screen are locked automatically.

Headset

You can connect a compatible headset or compatible headphones to your phone.
Do not connect products that create an output signal, as this may damage the device.
Do not connect any voltage source to the audio connector. If you connect an external
device or headset, other than those approved by Nokia for use with this device, to
the audio connector, pay special attention to volume levels.

Change the volume

Press the volume keys up or down.