There is an enormous market for a good dumb phone. Or, well, idiot savant phone: makes calls, makes calls well, and does nothing but makes calls. Between those who just don't want a smartphone, and those who carry enough computing power to not want yet another Cray 2 in a pocket, there's a large niche for a phone that is just a phone, syncs contacts effortlessly, eliminates every unnecessary/redundant call step, is just the right size & shape, uses every available network aggressively & seamlessly, leverages every service to save money, and has as clear & pristine a sound as makes audiophiles drool. Instead, we have fat folders with idiotic interfaces designed to make you spring for a smartphone just to get something thinner & easier.
I saw Smith Corona collapse. A market for typewriters remains to this day, decades later, untapped. Dumbphones are following the same path: a viable market wrecked by an industry dazzled by the sometimes undesirable glitz of a competitor.
Whither the iPhone nano? Many want it.