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Usually the codes come in this order. In most cases you will use the Network (NCK) code.
Method #1 Insert a Non accepted simcard in your phone and power on. Once finished loading your phone will ask you to enter a code, enter the Unlock Code * (90% of Models will use this method)
Note: Non Accepted Simcard is any simcard not from the original provider
Method #2 Go to the dial screen on your phone as if you are going to make a call and press: #7465625*638*UNLOCKCODE# (8 digit unlock code)
Method #3 Go to the dial screen on your phone as if you are going to make a call and press: #0111*UNLOCKCODE# (8 digit unlock code)
Method #4 Go to the dial screen on your phone as if you are going to make a call and press #7465625*638*# Once prompted for code, enter the 8 digit Unlock Code. If Phone says, “Code Accepted” or “Network Unlock Successful” or “Not Yet Personalized” your phone is fully Unlocked.
The Not Yet Personalized is an error used for a variety of reasons. Right now it’s likely looking for new APN and MMS settings that you should have from your new phone carrier.
Method #5 NEW ADVANCED METHOD: Make sure that the phone PROMPTS for the code with a NON accepted sim card and that your IMEI is correct by dialing *#06# a. Go to the Dial pad and dial *#197328640# b. Please click on number  UMTS >  Debugging screen >  Phone Control >  NETWORK LOCK c. You will see 3 options d. Please click on number  Perso Sha256 INFO, the screen will change slightly e. Please hit the MENU button then when the menu pops up please carefully hit BACK to return to the previous screen f. Next Please click on number  Perso Sha256 ON, the screen will change again to a one line message g. Restart the phone on the screen by holding the power button and click RESTART h. When the phone prompts for the unlock code simply enter the unlock code provided to you i. Your phone is now permanently unlocked! Method
#6 – Alternate Samsung Method http://www.releasemycode.com/samsung-alt-instructions/
Additional help is here: http://www.releasemycode.com/new-samsung/