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I have a Samsung GALAXY S3 with a rooted Android 4.1.2. My network provider is AT&T.

I tried dialing *#7465625# but it doesn't work:

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  • At the end of most unlock procedures is a way to verify that the procedure worked. So find a procedure that matches to your phone, OS, baseband, etc., and see if they tell you at the end.
    – Paul
    Oct 1 '14 at 16:02
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You could try an app to do this, Samsung have removed/changed some of the Dialer codes on the Galaxy range.

GalaxSim Unlock seems to do what you want, it checks if SIM locked, and offers an in-app purchase to SIM unlock. Please note I have not tested this app.

You could also pop in a SIM from a friend's device that is on another network and that should tell you pretty quick!

enter image description here

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  • Thanks, it does look good but ironically it's not compatible with my device "This app is incompatible with all of your devices." :/ Oct 1 '14 at 15:15
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    That... Makes no sense!! D'oh! Let me look for alternative methods!
    – RossC
    Oct 1 '14 at 18:28
  • It is also not compatible with my Samsung Galaxy S5 SM-G900A :/ Jan 2 '15 at 17:48
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You can check easier just asking a friend to lend you their sim from another carrier for a minute, insert it and if it is locked the phone will ask you for a code.

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To use this method you need to update your S3 to 4.1.1 Jelly Bean which was released on December 3, 2013 by Samsung:

  1. dial the following keys *#197328640#
  2. Main Menu > 1 UMTS > 1 Debug Screen > [8] Phone Control > [6] Network Lock > Options [3]Perso SHA256 OFF
  3. 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 your phone.

(I personally don't have the [4] NW Lock NV Data INITIALLIZ, but I guess it might help others)

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