[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] andjohn:
POSSIBLE HARD BRICK WITH Android 4.3 STOCK ROM. YOU'VE BEEN WARNED!

Here you go guys, a FREE SIM UNLOCK with Radio upgrade into CM. I just wrote this up for work, so I thought I'd share it.

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Free unlock only works on 4.1.1, so you have to flash it using ODIN. I'm going to be hosting the 4.1.1 file, so please say tuned for that. ODIN and TWRP attached below.

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Process.

1. Copy the ODIN Images folder to your computer.

2. Extract ODIN3 to your computer and run it.

3. Power off the phone and take out the battery. Put the battery back in with a disallowed SIM (Rogers SIM on a Bell phone for instance).

4. Hold Vol Dn + Home + Power until the phone vibrates once, release power. Release all buttons when the phone asks if you want to continue into Download Mode. Press Vol Up to start Download Mode.

5. Plug the phone into your computer, ODIN should see the phone in the far left box. Press PDA and navigate to the 4.1.1 image. Click Start. DO NOT CHANGE THE OPTIONS. Re-Partition, Flash Lock, Dump, Phone EFS Clear, and Phone Bootloader Update should be unchecked, Auto Reboot and F. Reset Time should be checked. DO NOT TURN OFF THE PHONE OR UNPLUG IT. When the top left box turns GREEN and says PASS!, the phone should reboot. The phone is now on 4.1.1.

6. Unplug the phone from the computer, close ODIN and reopen it.

7. UNLOCK STEPS:

Just dial the following keys in the dialing program *#197328640#

Main Menu > [1] UMTS > [1] Debug Screen > [8] Phone Control > [6] Network Lock > Options [3]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 [6] Network Lock then choose [4] NW Lock NV Data INITIALLIZ ..... wait for a minute then reboot the phone.

*This is a PERMANENT UNLOCK, and does NOT trigger anything for warranty

8. The phone should now get a signal for the disallowed SIM that you installed earlier. If not, try the unlock again.

9. Power off the phone and take out the battery. Put the battery back in. Hold Vol Dn + Home + Power until the phone vibrates once, release power. Release all buttons when the phone asks if you want to continue into Download Mode. Press Vol Up to start Download Mode.

10. Plug the phone into your computer, ODIN should see the phone in the far left box. Press PDA and navigate to the June 2013 Radio. Click Start. DO NOT CHANGE THE OPTIONS. Re-Partition, Flash Lock, Dump, Phone EFS Clear, and Phone Bootloader Update should be unchecked, Auto Reboot and F. Reset Time should be checked. DO NOT TURN OFF THE PHONE OR UNPLUG IT. When the top left box turns GREEN and says PASS!, the phone should reboot. The phone now has the most updated cell radio as of June 2013.

11. Unplug the phone from the computer, close ODIN and reopen it.

12. Power off the phone and take out the battery. Put the battery back in. Hold Vol Dn + Home + Power until the phone vibrates once, release power. Release all buttons when the phone asks if you want to continue into Download Mode. Press Vol Up to start Download Mode.

13. Plug the phone into your computer, ODIN should see the phone in the far left box. Press PDA and navigate to the TWRP Recovery. Click Start. DO NOT CHANGE THE OPTIONS. Re-Partition, Flash Lock, Dump, Phone EFS Clear, and Phone Bootloader Update should be unchecked, Auto Reboot and F. Reset Time should be checked. DO NOT TURN OFF THE PHONE OR UNPLUG IT. When the top left box turns GREEN and says PASS!, the phone should reboot. The phone now has the TWRP 2.6 Recovery.

14. Close ODIN. You no longer need ODIN for anything else. Keep the phone connected to the computer.

15. Copy the newest nightly or newest stable CM install zip (http://get.cm/?device=d2att), and gapps install zip to a new folder on the SD card called Installation.

16. Power off the phone and take out the battery. Put the battery back in. Hold Vol Up + Home + Power until the phone vibrates, release power. Release all buttons when teamwin shows up on the screen.

17. Click the 'Wipe' button. Swipe the 'Swipe to Factory Reset' slider. Press Back, press back again.

18. Click the 'Install' button. Click the 'Installation' folder. Click the file that starts with 'cm...'. Click 'Add More Zips'. Click the file that starts with 'gapps...'. Swipe the 'Swipe to Confirm Flash' slider. The installation process will begin. Wait :)

19. Click the 'Wipe cache/dalvik' button. Swipe the 'Swipe to Wipe' slider. Click 'Back'. Click 'Reboot System'.

You should now have a SIM unlocked, radio updated, CM installed Galaxy S 3.