My friend have the nokia n71.He got the unlock code from the site http://www.unlocking4u.com/ .Where can get the security code?
security code
From the phone's User Guide.
If it has been changed, by reflashing the phone (then it is is back to the default that's stated in the User Guide).
Cool buddy...you can unlock your phone at low cost here http://www.theunlockarena.com/ .. You will also be able to get the unlock instructions for it there. Cheers!