Network Unlock your ATT SGS3 for free (howto)

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I just saw this on Reddit and tried it on my ATT SGS3. I used an old StarHub SIM I had laying around and it didn't ask for the unlock code, so I'm pretty sure it worked.

The instructions are for the GSM Note 2, but the author says it works for the GSM SGS3, too.

http://forum.xda-developers.com/show...89&postcount=1

I think you have to be on a stock ROM to get it to work. I was running UCALH9, bone stock. Don't forget to thank the OP on the other thread!

It doesn't work on TELUS SGS3 :/

Sent from my SGH-I747M

Originally Posted by yulet

It doesn't work on TELUS SGS3 :/

Sent from my SGH-I747M

just tried it everything seems the same any way to tell without putting in another sim?

Originally Posted by AndreaCristiano

just tried it everything seems the same any way to tell without putting in another sim?

I don't know. Since the SIM I had laying around was not a mini-SIM I had to chop it up, too. O_O

In theory you don't ever see the unlock prompt unless you insert a non-network SIM anyway, so I don't think there's any way to check without one.

Originally Posted by yulet

It doesn't work on TELUS SGS3 :/

Sent from my SGH-I747M

Same here. I tried all the steps, but when I got to "now you are in [6] Network Lock then choose [4] NW Lock NV Data INITIALLIZ", I didn't have the "[4] NW Lock NV Data INITIALLIZ" option, just the original 3 choices.

Ian

Ok so I didnt think this would work but it honestly did took two tries but I was able to insert a tmobile sim on a locked att phone without being prompt for the network unlock code and I did confrim I was able to make a call

Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Originally Posted by w98seeng

Same here. I tried all the steps, but when I got to "now you are in [6] Network Lock then choose [4] NW Lock NV Data INITIALLIZ", I didn't have the "[4] NW Lock NV Data INITIALLIZ" option, just the original 3 choices.

Ian

Tried two different Bell phones.....same outcome.

If you are in the US with AT&T just call AT&T and tell them you are traveling abroad. You'll get the code right away. I chatted with support with a 2-week old SIII and got it right away.

The menu doesn't work on Rogers S3. oh well....

Originally Posted by ndy4eva

The menu doesn't work on Rogers S3. oh well....

you might need to update your modem/baseband for this to work. i upgraded the modem and then these steps worked just fine. (from LG1 to LH9 on att)