Sometimes your handphone get trouble in software whether infected by virus or too many programs installed in the phone and that's all makes you get sucked.
One solution to restore to the beginning...
I Pressume you want the unlock codes for the phone so you can use it with any operator? If so, these are phone and operator dependand so I would recommend you to contact the current operator.
Here are a couple of codes to soft/hard reset/format a Nokia mobile devices:First Go Phone settings > Phone > Restore Factory Settings and press OK.When prompted, enter your Phone code and...