Format Nokia Lumia 510 if you have forgot your password and want to reset it. This method is very simple and easy, and you can Unlock all codes with this trick. If you Don’t want to delete your contacts and messages then don’t try this because using this trick all data will be deleted on mobile memory. So take backup before try this trick. You can save all your contacts and messages via some software available in market.
How To Unlock Security Code On Nokia Lumia 510
Power off nokia lumia 510.
Press and hold Volume Down + Camera and Power buttons together until Nokia logo appear on screen.
After logo appear your mobile formated and you have mobile default settings.
Make necessary settings after format mobile.