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Changing Your Settings 109
3. Select a device administrator and follow the prompts. If
no device administrators are listed, you can download
them from the Play Store.
Unknown sources
This feature allows you to download and install applications
from locations other than Play Store.
1. From the Home screen, tap ➔
Settings
➔
Security
.
2. Tap
Unknown sources
.
A check mark is displayed to indicate it is active.
Warning!
Enabling this option causes your phone and personal
data to be more vulnerable to attack by applications
from unknown sources.
Trusted Credentials
If a certificate authority (CA) certificate gets compromised or
for some other reason you do not trust it, you can disable or
remove it.
1. From the Home screen, tap ➔
Settings
➔
Security
.
2. Tap
Trusted credentials
.
The trusted credentials screen has two tabs:
• System
: Displays CA certificates that are permanently
installed in the ROM of your device.
•User
: Displays any CA certificates that you installed, for
example, in the process of installing a client certificate.
3. Tap a CA certificate to examine its details.
A scrolling screen displays the details.
4. Scroll to the bottom of the details screen and tap
Disable
to disable a System certificate or
Remove
to remove a
User certificate.
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.
5. Tap
OK
to return to the certificate list.
When enabled, a check mark appears in the check box.
Install from device storage
Install encrypted certificates from an installed memory card.