Sony Xperia 1 User Manual page 21

Unlocking Screen
While Display is off (screen is locked), Press Power Key
Lock Screen appears.
・Alternatively, if Ambient display is enabled, Double-Tap
Ambient screen or Press Power Key.
Flick screen up
Screen is unlocked.
・The method for unlocking the screen can be changed.
・For fingerprint authentication, Touch Fingerprint Sensor
with authentication finger to unlock screen.
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