Nokia C21 Plus - Lock or unlock your phone

Nokia C21 Plus User Guide
LOCK OR UNLOCK YOUR PHONE
Lock your phone
If you want to avoid accidentally making a call when your phone is in your pocket or bag, you
can lock your keys and screen.
To lock your keys and screen, press the power key.
Unlock the keys and screen
Press the power key and swipe up across the screen. If asked, provide additional credentials.
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