Thank you for your continued patience. Are you trying to unlock your phone so that you can use a different SIM card in the phone or are you referring to the security code which is requred in order to get into the phone period?
Unfortunately unless the generic codes such as 0000, 1234, or the last 4 numbers of the devices' phone number works, there's no easy way of getting the phone unlocked. You could send it to a Samsung service center and have them unlock the phone or you could send it to a local cell phone center but I'm not sure how much they'll charge or if they charge anything. Often times the cost of unlocking a phone will exceed the value of the device. Sorry for the bad news :(
Let me know if you have anything else I may assist with, otherwise please click 'accept'
Thank you and happy new year