Security; Screen Lock; Face Recognition - Samsung Galaxy A03s Manual

SECURITY

Screen Lock

Settings > Lock screen > Screen lock type
It is recommended that you secure your device using a Screen
lock. This added level of security helps prevent someone from
accessing your device including your personal data, apps, and
email accounts. There are a variety of screen lock types with
different levels of security for your selection including a swipe,
a pattern, a numeric PIN, a password, face recognition or
fingerprint.
In addition, you can set a Smart Lock to unlock your device
automatically and keep it unlocked when it's on you, when you
are in a trusted location or when trusted devices are detected.
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Face Recognition

Settings > Biometrics and security > Face recognition
Face recognition is an added security option that will let you unlock
the screen by simply raising your phone and looking at the screen.
Before you enter your face scan, you will need to set a secure
screen lock type and allow Face Recognition to take pictures and
record video in order to complete the set-up process. Once you
have completed the set-up, your phone will also show notifications
on your lock screen when you are looking at it.
Face scans can be deleted or updated as necessary. The data
used to recognize your face is kept private on your phone.
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