Enough is enough - I am ordering this today. I'll take a risk and if it's the wrong one, I'll return it.
Wish me luck!
By the way, I got this email back from Nokia this morning regarding where I can buy the RM-938:
Hi Collin,
Thank you for emailing Nokia Careline.
We understand that you would like to buy a Nokia and RM-938 variant of the Lumia 1520 to be used with T-Mobile network. We would like to inform you that this device model is Latin American variant. Thus, it is not available in the USA market. We would like to inform you that we do not have an international warranty. Meaning, warranty terms are valid only in the country where the device was purchased. As a result, you should bring a device for repair and receive the service in the country where the device was originally came from.
If you wish, you may contact your current operator for the unlocking information. However, we wouldl like to remind you that since your device was designed with AT&T in the USA, some of its features may not work with a different network.
If you have any additional questions, please do not hesitate to contact us again. To ensure proper handling of your case, kindly continue using the current subject line.
For future reference, you may check our website. Kindly refer to the link below:
http://www.nokia.com/us-en/
You may also call Nokia Careline at 1-888-665-4228 from Mondays to Fridays at 10:00 a.m. - 8:00 p.m. EST (closed on national public holidays) for immediate assistance.
Kind regards,
Jane M.
Email Specialist
Nokia, Inc.