Zte Z557BL User Manual page 145

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: Permit installation of apps from
sources other than the Play Store.

Storage type: Check the credential storage type.

Trusted credentials: Display trusted CA certificates.

User credentials: View and modify stored credentials.

Install from SD card: Install certificates from the memory
card.

Clear credentials: Delete all certificates.

Trust agents: View or deactivate trust agents.

Screen pinning: Keep a screen of your choice in view so
others cannot switch and access personal information.

Apps with usage access: Turn on or off some apps'
access to your phone usage information.
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