Re: You can have a single worldwided model that supports all bands
"That's not really true anymore, and it was never an issue of chipset so much as an issue of the discretes like power amplifiers and antenna switches, but Qualcomm sells a solution for this (google qualcomm rf 360)"
I've looked. So far as I know, no one's using it or we'd see a phone that can advertise "compatible with ALL LTE bands worldwide". Since I've yet to see one and given this would be quite a selling point for a globe-hobber, I have to assume something else is getting in the way.