
Microsoft Lumia 640 XL
Find "change password"
Slide your finger down the display starting from the top edge of your phone.
Press ALL SETTINGS.
Press ALL SETTINGS.
Press lock screen.
Press change password.
Change phone lock code
Press the field below "Current password" and key in the phone lock code.
Press the field below "New password" and key in a new phone lock code.
Press the field below "Confirm password" and key in the new phone lock code.
Press done to confirm.
Return to the home screen
Press the home icon to return to the home screen.