Samsung Galaxy J3 6 User Manual page 297

3. Draw your unlock screen pattern, enter your PIN, or enter your password.
4. Tap None.
 The screen lock is disabled.
Device Security
Configure security for your phone.
1. From home, tap Apps
 The Lock screen and security menu opens.
2. Tap ON/OFF next to Unknown sources to enable installation of non-Google Play applications.
Settings
> Settings > Lock screen and security .
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