[Q] Sim unlock S4 active (SGH-I537)? - Galaxy S 4 Active Q&A, Help & Troubleshooting

Hello. I just bought a Galaxy S4 active (I537) for AT&T and would like to SIM unlock it. What is the best way to do this? I would be willing to root and unlock that way, or could unlock using one of the internet services, but what would be the best internet service to use? I cannot just call AT&T to unlock it. I am somewhat familiar with rooting, so if there is a way to do it that way that would work.
Thanks!

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