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[Q] How to Unlock Samsung S3 AT&T running Andriod 4.3

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Default [Q] How to Unlock Samsung S3 AT&T running Andriod 4.3

I have a Samsung S3 I747 device. It is running ANdriod Version 4.3, I747UCUEMJB.
I wanted to unlock this and was wondering if this is possible. I went through lot of threads on this forum, but that left me confused and could not figure out if it is possible or it is not possible, without calling AT&T or without buying the unlock code.

There were some threads which said that we can go back to 4.1.1 or something. (I have been able to unlock the other phone which is running 4.1.2 but for this I cannot go back).
I am a newbie with phones and andriods, and hence was looking for simple instructions if any available to lock this 4.3 andriod that I have.

Any help would be greatly appreciated.
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Once on 4.3 or later the free unlock method will not work. Only getting a code from the carrier or buying one online will.
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