This is well versed around the net now and we take no credit for it (Source) but as the site dose focus on unlocking from time to time I'm going to add it to our archive!
Before you start Make sure your phone is running Android 4.1 (Jelly Bean) and that it is already carrier locked (duh) also please note this method only works on certain variants for the Galaxy S3/Note2 and Mini3 not all and finally please note we take no responsibility for bricking your galaxy so don't cry to us if you mess up, this is at your own risk people!
1. Open the Dialer and type in *#197328640#
2. Main Menu -> [1] UMTS -> [1] Debug Screen -> [8] Phone Control -> [6] Network Lock -> Options [3]Perso SHA256 OFF Now wait 30 seconds
3. Hit the Menu button and select Back and you should now be in the Network Lock
4. Choose NW Lock NV Data INITIALLIZ and again wait but for a Minute this time
5. Reboot the phone
Bare in mind there is no acknowledgement that the phone is now unlocked so the only way to know is to try another carrier sim. And that the Time waiting is key so don't rush it.
All Credit to Owl47 over at XDA Developers and you can read the original Here with loads of follow up information.
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