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Set a SIM PIN Lock
A PIN is the identity code of a SIM card, and can be set as the SIM card lock. After you set it
up, you will be required to enter the correct PIN to unlock the SIM card every time you power
on your phone or switch to a new phone to prevent unauthorized access.
If you have entered a wrong PIN and exceeded the maximum number of attempts allowed to
unlock the PIN, you will need to enter the PIN Unlocking Key (PUK) then reset the PIN. If you
exceed the maximum number of attempts allowed to unlock the PUK, your SIM card will be
permanently blocked.
The PIN and PUK of your SIM card are provided by your carrier. The number of digits and
maximum number of attempts allowed to unlock your PIN and PUK are subject to your
carrier.
1Go to Settings > Security > More settings to enter the SIM lock settings screen.
2Enable Lock SIM card, enter the PIN, then touch OK.
To change the PIN, touch Change SIM PIN, and follow the onscreen instructions.
Pin a Screen
You can pin the screen of an app so you can stay focused on it. Try this feature when playing
games, watching videos, and more.
Go to Settings > Security > More settings > Screen pinning, and enable Screen pinning.
When using gesture navigation, swipe up from the bottom of the screen and hold to access
the recent tasks screen, then touch on an app preview. To unpin, swipe up twice from
the bottom of the screen.
When using three-key navigation, touch to access the recent tasks screen, and touch
on an app preview. To unpin, touch and hold .
Safe Mode
Safe mode uses a simplied operating system on your phone with only basic functions and
pre-installed apps available. It can be used to locate third-party apps causing system failures.
Safe Mode Functions
After installing certain third-party apps, your phone may fail to work properly. In this case,
you can enter Safe mode to check whether the problem has been caused by a third-party app
or by the system itself.
If the system is running properly in Safe mode, the issue is likely caused by a third-party
app. In Safe mode, go to Settings > Apps > Apps, nd the third-party app in question, and
uninstall it after switching back to the normal mode.
Settings
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