Zte Z917VL User Manual page 111

Change SIM PIN: Change the PIN used to access the

nano-SIM card.
NOTE:
Put all your confidential passwords in a safe place for future
use. If you enter the wrong SIM PIN more times than
allowed, your nano-SIM card will be locked and you cannot
access the mobile phone network. Contact your operator for
a PIN Unlock Key (PUK) to restore the nano-SIM card.

Make passwords visible: Display passwords as you enter
them.

Device administrators: View or deactivate apps you have
authorized to be device administrators. Unknown sources:
Check this option to permit installation of apps from sources
other than the Play Store.

Unknown sources: Allow installation of apps from
unknown sources.

Storage type: Check the credential storage type.

Trusted credentials: Display trusted CA certificates.

Install from SD card: Install certificates from SD card.

Clear credentials: Delete all certificates.

Trust agents: View or deactivate trust agents.

Screen pinning: Keep a screen of your choice in view, so
that others cannot switch to other apps and access your
personal information. Touch this option to see how it works.
 Apps with usage access: Turn on or off some apps'
access to your phone usage information.
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