Do you want to unlock from security,password lock or from network lock?
To unlock from security lock you can use default codes.You can find the details in user manual.If you need to unlock the Blackberry phone from network lock,to use with other network sim card.You can use network unlock code.Visit the site Theunlockspot.com get the unlock code at reasonable cost and unlock it easily.You need to provide details like network,country it is locked now,IMEI number and mobile phone model to get unlock code.