Samsung SM-A920F User Manual page 48

Basics
Lock screen
Pressing the Power key turns off the screen and locks it. Also, the screen turns off and
automatically locks if the device is not used for a specified period.
To unlock the screen, swipe in any direction when the screen turns on.
If the screen is off, press the Power key or on the Always On Display, double-tap the Home
button to turn on the screen.
Locked screen
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