I'll disagree. I worked previously "somewhere" that had yearly budget of tens of millions of dollars in order to tackle this specific issue - bringing internet to people that do not have it. We had extremely good data, most of which not available publicly; dozen(s) of people working solely on identifying scope of problem while other people trying to come up with solutions.

I don't have the data anymore so I can argue with you on exact numbers , but even when you are talking about 3/4g networks, in most of the cases it will be 3g and rolling out 4g is too expensive and backbone wont have enough capacity to serve all the people that are lacking access.

>Electricity might be an issue in some areas but according to our assumptions, more than 160 million secondary students in low and low-middle income countries live in cities and areas where electricity is not an issue.

You cant really just buy enough hardware for everyone. It doesn't work well on scale. See one laptop per child.