Samsung Galaxy S4 Unlock - AT&T Samsung Galaxy S 4 Q&A, Help & Troubleshootin

Hi,
I have a Samsung Galaxy S4 Att with Android 5.0.1. I requested unlock code from att and the code they gave me is not working.
Can some one help me with unlocking the device.
Thanks,
Sravan.

I haven't seen anything about unlocking an S4 running 5.0.1, but you can flash the phone back to nb1 base and unlock it. Then when you flash back to 5.0.1 the unlock should stick. See this thread on unlocking, for instance. See this or this for flashing back to 5.0.1.
Disclaimer: I do not own an S4 so can not test this.
You may be able to find more information in the forum here if you search.

First of all I can't believe AT&T actually gave you an unlock code that's amazing the best bet to sim unlock your phone is to downgrade your modem then use region lock away then upgrade your modem again then boomshockalocka you will have a sim unlocked device
Sent from my i337 on dark carnage rom

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Hi. I'm trying to unlock my S4 to use another sim. It's locked to EE. It's now been 2 years so I've got the S6 today. Giving the S4 to my partner.
I tried the *#0011# method. Can't get to the UMTS menu. Tried the Region Unlocker App without success. I tried downloading a random 4.2.2 ROM from the development section to access the Service Menu and I'm now stuck in a boot loop. I used to have 4.4.2 installed.
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Unlocking only works on stock ROMs. If you downloaded a Jellybean ROM from the development section, you're doing it wrong.
While the unlock methods used here do work if the directions are followed correctly, there's no guarantee the unlock will be retained with ROM updates or baseband changes. You're better off asking EE for an unlock code, or buying an unlock code. Unlike the unlock methods here, once that code is input, it unlock the device for good.
Questions belong in Q&A, not General.
Thank you.

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I have a rooted Samsung Galaxy S4 i337m Canadian locked to Bell. Is there something I can do on this rooted device to sim unlock it?
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