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your privacy. See Protecting Your Phone With Encryption.
Set up SIM card lock: Touch a micro-SIM card and you can
manage the following settings.
Lock SIM card: Activate or deactivate the PIN lock to
require PIN before accessing the micro-SIM card.
Change SIM PIN: Change the PIN used to access the
micro-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 micro-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 micro-SIM card.
SMS message limit: Display an alert dialog to prevent
applications from sending SMS messages too frequently.
The default limit is 30 messages in 15 minutes.
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.
Verify apps: Disallow or display a warning before you install
applications that may cause harm.
Storage type: Check the credential storage type.