Nokia Lumia 900

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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.
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Get started