Hi you can unlock your mobiile by getting codes from http://www.Ihav.net/.Try here dude.The codes i bought here were with instructions.which made the unlocking much easier.
Do you want unlock your nokia 5230 mobile sim network lock? First you can visit this site Simpleunlocking.com here you can get the unlock code an unlock your mobile. To get the code you have to mentioned which country is locked now,network provider and imei number. Then they send unlock code through email.