There's a USB connection in the back, you know... Maybe an alternate battery cover with built-in data connection? (Alas, it's only a 4-pin port, so either a mini dongle just to force OTG mode, or software switching, is required...)

That can be fixed, for the future, with an additional radio slot; maybe USB, maybe not, but some dedicated connection under the back cover, so the cover can be replaced with a bulged one for bigger battery and an extra radio.


Honestly, I can see this working great even on existing hardware, as outlined above, but I'm not quite sure enough it's what I really want to go buy the modem and try hacking such a thing up, and I'd have to do some battery-hunting as well.