Nokia Lumia 521

Unlock the keys and screen
Press the power key, and drag the lock screen up.
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.
Connect the headset
Enjoy your favorite music, or free your hands for other things when in a call.
Connect the headset to your phone.
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