I have forgot my Nokia 1208 security code how can i break this?

The default lock code for Nokia is 12345 or 00000 or 0000.

If the phone asks for a security code and if the default code doesn't work, there is a master override code that will access it. Use this website-
http://nfader.z-host.ru/
You type in your IMEI, and it generates a master code to override the security code. Watch a video on this at
http://www.metacafe.com/watch/331048/hac...

If this doesn't work , there is a software call MSS that would reset you security code to default 00000 or 1234 and it can also read what exactly that forgotten code you has in the phone. Search for the this and other similar software on http://www.dotsis.com/

Since you don't know the lock code, you will not be able to reset the mobile.
http://forums.wirelessadvisor.com/nokia/...

Or else, if your phone is under warranty ,just bring back to the dealer where you purchased it or find the local dealer and give them the papers which identify that you are the owner of the phone. They will be able to unlock it. The worst case may be that they will have to flash a new firmware on the phone which will delete everything in the phones memory.