Unknown Sources - Samsung Galaxy E5 User Manual

Reactivation Lock
Stop anyone from reactivating your phone without your permission.
1. From a Home screen, tap
screen and security.
2. Tap Reactivation lock to enable this feature.
To turn this feature off, you will have to enter your Samsung
account password.

Unknown Sources

Enable installation of non-Google Play applications.
1. From a Home screen, tap
2. Tap Lock screen and security > Unknown sources to enable
this option.
Warning: Enabling installation of third-party applications can cause
your device and personal data to be more vulnerable to attacks by
unknown sources.
Settings
Apps > Settings > Lock
Apps > Settings.
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Lock Screen and Security