It's not just a s/w issue, some radios would need to be "tuned" for those additional bands; I don't think they sell many phones with the idea of "enabling" bands, at some point, unless they were just "disabled", at RTM.
There are financial and licensing issues too, the FCC approved that device, with ONLY those bands, so they'd have to re-submit all that, as well.
Even if the band is easily "supported", this seems like a "reach", and to what end really, it would still just have very limited Verizon service.
And yeah, like JHBThree pointed out, there's no CDMA support, which is DEFINITELY NOT a s/w fix ;-]
I think if Verizon approached them, it might be a different story, but I don't know if it's really something OP would pursue themselves at this point (pure speculation though), given that they seem to be exceeding any sales forecasts, with a GSM-only device.
Plus, it works almost anywhere else in the world right now, or close, it's all basically the same h/w (and mostly f/w too), the US is the only one with a dated, goofy CDMA system, even if it is the best provider, for outside metro areas anyway (TMo is really good here, but only in large metro areas, IME, they fall apart fast, but boy are they fast in-metro, I live about 5mi from their headquarters, and could pull 150/100 or so, when I had them briefly, a couple of years back).
While I know that most carriers aren't exactly "great business partners", the stuff I read about Verizon has long (19 years now) kept me with AT&T (except the brief interlude with TMo, about 1.5 months, rural was THAT bad), and continues to do so.
IF Verizon ever moves to "real LTE" coverage (in-place of their CDMA installs), I could see myself having a prepaid SIM, as a secondary, the cheapest plan, for those times when needed coverage, people like my brother pulled out his Verizon phone...
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