HI if you want to unlock your phone from network lock .Then free unlocking codes are available only for some older mobile models ..Else if you want to unlock some new model phones then have a look at sites like MobileUnlockSolutions.com here they are rendering unlock code for all mobile models at reliable cost..After purchasing the code visit sites like MobileUnlockGuide.com here they render free instruction about how to input code in your mobile to unlock it .,