So is the Lumia 810 for TMobile a Lumia 820 with a different name? It doesn’t appear that way. Here’s Nokia’s site. The size and weight differ as does the battery. The screen may be different too but it’s pretty clear that Nokia needs to update the info on the 810 as some ‘features’ that are missing are really inherent in WP so they must be there. So there’s still some things left to answer but here’s the key differences:
When the rest of the blanks are filled in we’ll have more. It’s more than just a renaming though.