Having traveled widely in three of the four most populous countries I’m a bit dubious of this claim. Having decent 4G in the middle of nowhere in India or Indonesia is pretty standard these days. I haven’t been to Africa, but a quick search suggests more than two thirds of the population of the continent has 4G coverage, and more than 80% has 3G. Where are these huge numbers of people on 2G?

In Ukraine we use to have a lot of 2G devices: energy meters, terminals in grocery shops, panic buttons and anti-theft devices.