[dataflow]

Not really. Nobody's swearing under penalty of perjury here, 100.000% accuracy is very much not a requirement. I think a best-effort list would go an insanely long way, and carriers already have large IMEI->model mappings for a lot of phones all over the world. And there are already gazillions of random websites with databases of model->band mappings out there too. And in the absolute worst case where they see a device they have zero clue about they could at least give a slightly different message like "we don't know if this is supported, but please be aware [...]" or whatever, and annotate their profile for the rep accordingly. Again: perfection is not required here.