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The PIN protects your SIM from unauthorised use if your phone should get stolen. If use of PIN is turned on, it needs to be keyed in when you turn on your phone.
Find "Set up SIM card lock"
Slide two fingers downwards starting from the top the screen.
Press the settings icon.
Press Set up SIM card lock.
Turn use of PIN on or off
Press Lock SIM card to turn the function on or off.
Key in your PIN and press OK.
Return to the home screen
Press the Home key to return to the home screen.
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