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The phone lock code prevents others from accessing the contents of your phone (such as pictures and messages). When the phone lock code is turned on, it needs to be used every time you turn on your phone and when it has been in sleep mode.
1. Find "Sign-in options"
Slide your finger downwards starting from the top of the screen.
Press All settings.
Press Lock screen.
Press Sign-in options.
2. Turn on use of phone lock code
Press the field below "Password" and key in the password for your Microsoft account.
Press New PIN and key in the required phone lock code.
Press Confirm PIN and key in the phone lock code again.
3. Turn off use of phone lock code
4. Return to the home screen
Press the Home key to return to the home screen.