Install the latest version of Nokia PC/Ovi Suite
& connect your phone to your computer with a USB data cable. (always use ovi / pc suit mode) =>Launch NSS & scan for devices using the scan Icon ==>Click the "Phone Info", and then click "Scan" button. It will display the details of the very phone you wanna unlock. => Select "Local" under Power mode . Then click "Change". Your phone will immediately restart automatically =>from "Local Mode" across the screen of your phone Under Production Data Edit, => Locate and click the "Read" button. =>Beside the Product Code, check the "Enable" check box. Then click "Write" button. => From this point now select "Tools" on top. And then click the "Factory Settings" tab at the bottom. =>chooose "Full Factory" and then click "Reset" button. => To complete the whole process go back to "Phone Info", select "Normal" under Power Mode, and click "change".
Hurray ur security code has now been changed to 12345.