Originally Posted by sRs DoLLaR mEnU
I had the same problem when I got my s4 the other night. I traded my factory unlocked iPhone 5 for my s4. The guy told me it had not been updated to mf3. It had been though. I can confirm that RegionLockAway sim unlocked my phone. Root the phone, run regionlockaway and reboot with your unsupported sim card in. I'm currently using my att s4 on tmobile. This method saved me 20 bucks for the unlock.
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Thanks for the post. I just purchased a S4 from AT&T, and will try that method. I've rooted many phones but since you unlocked yours, I'm curious as to which Rooting method you followed. I want to use it for T-Mobile....
Never argue with stupid people, they will drag you down to their level and then beat you with experience...