How do you unlock the AT&T S3 for use on TMobile?

[JEGuitarist]

My girlfriend is giving me her old S3 since she just upgraded to the new model, but I don't want to use AT&T, I'd like to switch to the Tmobile $30 a month plan. How do I go about unlocking the phone so I can switch? I've read a lot about unlock codes, and a lot of different ways to go about it..just not sure where to start.

Thanks
-JEGuitarist

 

[jd914]

If the phone is off contract and her account is in good standing she needs to request an unlock directly from AT&T, it's free https://forums.androidcentral.com/e...Fwww.att.com%2Fdeviceunlock%2F&token=mQbcJd_g

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[JEGuitarist]

Alright, I had her fill that out. Thanks for your help!