A brief history of the numeric keypad (2018)

I am positive I saw a picture ages ago (late 1980:s, when keypad phones were starting to become mainstream in Sweden) where someone had "solved" the problem by building a pocket calculator with a rotary dial. I'm not sure whether it was a mock-up or an actual device. :)

Benford's Law is relevant https://en.wikipedia.org/wiki/Benford%27s_law

it would be interesting to see a smartphone dialer app that plays with different input designs specifically made for modern touchscreens