Iphone 4s won't unlock from AT

I went to https://www.att.com/deviceunlock/ and submitted my device unlock request for my AT&T iphone, which is out of contract.  I received the following approval:
Unlock request number: 2010855198
Thank you for contacting AT&T about unlocking your mobile device.
Congratulations! Here are your unlock instructions:
1. Open iTunes on your Mac or PC and verify that you have Internet connectivity.
2. Ensure the original SIM card that came with this device is inserted in your iPhone.
3. Connect your iPhone using the dock connector to USB cable that came with your iPhone.
4. Backup and restore your iPhone using iTunes. For information on backup and restore, please visit http://support.apple.com/kb/HT1414.
5. After restoring, your iPhone will be unlocked.
Additional information on unlocking can be found at http://support.apple.com/kb/HT5014.
Questions? Please call 800.331.0500, or dial 611 from your AT&T wireless phone.
I followed these steps, and the ones on HT1414 and HT5014, and the phone still wouldn't unlock.  I tried many times and several iterations of the apple and AT&T procedures, but every time I put in any one of three different T-Mobile sim cards I would get the following message:
"The SIM card inserted in this iPhone does not appear to be supported. Only compatible SIM cards from a supported carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported carrier store."
I have the latest iTunes updates.  I've tried erasing all content and settings on the iPhone, creating and restoring multiple backups from both iTunes and iCloud, resetting to factory conditions, rubbing my head and patting my tummy, but nothing seems to work.
I called 800-331-0500 and spoke to two different AT&T reps, but they weren't able to help me.  I called Apple support at 80-676-2775, and spoke "unlock iphone," which transferred me to what appears to be 800-MY-IPHONE.  After dialing in my phone number, the message said that I needed to subscribe to an apple support plan in order to receive phone support.
***?  Help!!

Actually the message was "The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server.  This is not a hardware issue with the iPhone.  Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier.  Please contact Apple from more information."

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