I have forgotten my security unlock code i created

You have committed the greatest sin in today's world by forgetting the security code. You will be destroying the data that you wanted to protect. Friend, the only way out is to reinstall the firmware again, thus loosing all the data including contacts. I know you would hate me but this is the only choice left. After that remember to NOT use any codes ever as one tends to forget such trivial matters sooner or later.

Hello. Thanks for choosing fixya! your by default security code is 12345 for every nokia cellular phone. However, if you change it earlier than the only new changed code is working. but if you forget your changed code then go to the mobile service center they will solve this through their computer.