Nokia T20 user guide
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Control volume
Change the volume
To change the volume of the tablet, press the volume keys on the top left corner of your tablet.
To change the volume for media and apps, press the volume down key to see the volume status bar, tap tune, then drag the slider on the volume bar for media and apps left or right.
Do not connect to 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 for use with this device, to the audio connector, pay special attention to the volume levels.
Set the tablet to silent
To set the tablet to silent, press the volume down key and tap notifications_none.