Worked perfectly. Stock Bell SGS3.
Now, it wasn't stock to begin with - I was running Task650's AOKP on it. Of course the instructions didn't work on that so I flashed a stock Bell ROM onto it then it worked perfectly. Phone unlocked on the first try.
Some of the menu items weren't exactly in the same place but they had the same names so no problems finding them.
Originally Posted by rkmullins
Unlock your Samsung Galaxy S3, Note 2 and Ruby. Free. No Rooting. No Hacking.
Just dial the following keys *#197328640#
 Debug Screen
 Phone Control
 Network Lock
Options Perso SHA256 OFF
(after choosing this option, wait about 30 seconds, then go back one step by pressing the Menu button then select Back, now you are in
 Network Lock then choose
 NW Lock NV Data INITIALLIZ ..... wait for a minute then reboot your phone