Earlier quoted context omitted.
That's the politically correct way to look at it but I don't think you're right. With the advent of the $30 smartphone, by the time these countries have disposable income that you can indirectly or directly profit from, its likely that one of their first purchases is a better phone with a capable browser. Until then they're a waste of time and resources. On Black Friday you could get a Moto E, unlocked and off contra…
And which magic exactly does that phone perform to reduce the bandwidth prices of their provider?
But even putting that aside, you're ignoring the fact that as these developing nations develop and have money that's worth going after, bandwidth is certainly going to become cheaper as well.