Microsoft Lumia 550

Find "Sign-in options"

Slide your finger downwards starting from the top of the screen.

Find "Sign-in options"

Press All settings.

Find "Sign-in options"

Press Personalisation.

Find "Sign-in options"

Press Lock screen.

Find "Sign-in options"

Press Sign-in options.

Turn on use of phone lock code

Press Add.

Turn on use of phone lock code

Press New PIN and key in the required phone lock code.

Turn on use of phone lock code

Press Confirm PIN and key in the phone lock code again.

Turn on use of phone lock code

Press OK.

Turn off use of phone lock code

Press Remove.

Turn off use of phone lock code

Press Remove.

Return to the home screen

Press the Home key to return to the home screen.