Nokia Lumia 820 - Manual (Page 22)

Unlock the keys and screen
Press the power key, and drag the lock screen up.
Tip: Instead of pressing the power key, you can also double-tap the screen if double-tap is
switched on. To switch on double-tap, tap Settings > touch, and switch Double tap to wake
up phone to On.
Set the keys and screen to lock automatically
On the start screen, swipe left, tap Settings > lock screen > Screen times out after, and select
the length of time after which the keys and screen are locked automatically.
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