User guide

52 2C. Settings
䡲 Automatically locking the device.
䡲 Restoring factory settings.
1. Press and tap > Settings > Security >
Device administrators.
2. Select a device administrator and follow the
prompts. If no device administrators are listed,
download one or more from the Play Store.
Unknown Sources
This feature allows you to download and install
non-Market applications.
䊳 Press and tap > Settings > Security >
Unknown sources.
Credential Storage Trusted Credentials
If a certificate authority (CA) certificate gets
compromised or for some other reason becomes
unstable, you can disable or remove it.
1. Press and tap > Settings > Security >
Trusted credentials.
Two tabs display:
䡲 System: Displays CA certificates that are
permanently installed in the ROM of your device.
䡲 User: Displays any CA certificates that were
installed, for example, in the process of installing
a client certificate.
2. Tap a CA certificate to examine its details.
3. Scroll to the bottom of the details screen and tap
Disable to disable a System certificate or Remove
to remove a User certificate.
Note: If a device uses multiple enabled administration
applications, the strictest policy is enforced.
WARNING: Enabling this option makes your phone and
personal data more vulnerable to attack by
applications from unknown sources.
Caution!: When you disable a system CA certificate, the
Disable button changes to Enable, so you can
enable the certificate again, if necessary. When
you remove a user-installed CA certificate, it is
permanently deleted and must be re-installed, if
needed.