Do you want to remove SIM lock from your phone ?
If so, use unlock code to unlock your phone. It is more secure to unlock your Nokia than imei unlock.
If you want to break security code lock from your phone?
If yes then get Master reset service from any of the online service providers like http://www.unlock-free.com/
to break security code lock from your phone. Here, they will provide free Master reset code for Alcatel and Nokia DCT phones.