This is confirmed by myself to work on the AT&T Galaxy S3 and AT&T Galaxy Note 2 ....and it is reported to work on ALL VARIANTS of GSM.
I am posting it publicly to give where credit is due, and to KILL the eBay profits, specifically eBay Item: 321033698090
Please do not profit off someone elses' idea and eBay this info like the Joker in the auction above
To unlock your Galaxy S3 OR NOTE 2:
Just dial the following keys *#197328640#
Main Menu >  UMTS >  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... enjoy!!!
*This is a PERMANENT UNLOCK, and does NOT trigger anything for warranty
/standard disclaimer: I am not responsible if you don't follow directions and what you do with your phone
spnj said: .I see SHA256_ENABLE_FLAG  and choose  NW Lock NV Data INITIALLIZ waited a minute and restarted my phone... how to confirm if its unlocked ??Not sure if there's an easier way to find out, but I usually know someone who uses a different phone service and just use their SIM card to do a quick test. Your phone should recognize the SIM card and pick up the cell tower. Otherwise, I think it gives some message indicating it's for a different carrier or shows no signal.
Moderator Comment: Direct link to competing deal site removed. — Dec. 1, 2012 @ 1:15pm
Skipping 303 Messages...
posted: Apr. 13, 2014 @ 11:37p
pokumon said: Why don't you give it a try and report back?
The OP stated on GSM, so I'm guessing no on the CDMA versions like Sprint and Verizon...
I believe most of the answers to questions ppl have are on xda...
Also, the seller on eBay with listing 321033698090 almost looks like a college student selling stolen goods? I could be wrong, but since he's selling stolen goods from xda...
nguyenhiep said: Does this work for the Sprint Galaxy S3?
I've noticed some newer Spring phones come with a slot for a SIM card. Normally, you can't unlock a CDMA phone, like Sprint or Verizon, the way you can with a phone that uses a SIM card, as all GSM phones (AT&T, TMobile, MetroPCS) do. Could it be that the newer Sprint phones are also GSM-capable, and might work with a foreign SIM card? I've noticed some phones coming out of China that are unlocked for GSM but also are said to be CDMA capable.
Maybe you can just put a foreign SIM card in the Sprint phone. See it it works, or maybe it will if unlocked.
Disclaimer: By providing links to other sites, FatWallet.com does not guarantee, approve or endorse the information or products available at these sites, nor does a link indicate any association with or endorsement by the linked site to FatWallet.com.
Members of our community may attach files to a post in accordance with the User Agreement. FatWallet is not responsible for the content, accuracy, completeness or validity of any information contained in any attached file. Files have *not* been scanned for viruses. Be especially wary of Excel files which may contain malicious content.
Earn Cash Back while you shop - just 3 simple steps.
1. Sign Up so we know who to pay! (It's FREE.)
2. Shop through FatWallet for deals from your favorite stores. Your online purchases earn Cash Back that builds in your FatWallet account.
3. Get Paid by requesting a payment via check or PayPal.
FatWallet coupons help you save more when shopping online. Use our Coupons Search to browse coupons and offers from thousands of stores, gathered into one convenient location.
As part of our FatWallet Community, you can share deals with almost a million shoppers in our forums. Forum content is generated by consumers for consumers. Share deals, money-saving tips, and more. It's FREE, fun, and addicting.
Our customer experience team is here around the clock - real people ready to assist.