Device Administration
Activating this feature allows Google to administrate your phone in a
way similar to IT security settings on a corporate PC. This would be
beneficial in the case that your phone was lost or stolen. The phone
could be "deactivated" or "restricted" (through administration) from
a remote location.
1. From the Home screen, press
Security.
2. Tap Device administrators to begin configuring this setting.
3. Select an administrator device and follow the prompts.
Unknown Sources
Before you can download a web application you must enable the
Unknown sources feature (enables downloading). Developers can
use this option to install non-Play Store applications.
1. From the Home screen, press
Security.
2. Tap Unknown sources to active this feature.
Note: If you are notified that you can not download a Play Store
application because it comes from an "Unknown source",
enabling this option corrects this issue.
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and then tap Settings
and then tap Settings