Settings 366
4. Tap None.
The screen lock is disabled.
Device Security
Configure security for your phone.
1. From home, tap Apps > Settings > Lock screen and security .
The lock screen and security menu opens.
2. Tap ON/OFF next to Unknown sources to enable installation of non‑Google Play applications.
Warning: Enabling installation of third-party applications can cause your device and personal data to be
more vulnerable to attacks by unknown sources.