Penetration of cell phones was very fast in many African countries and they had the advantage of high speed wireless so didn't have to bother building hardwired infrastructure. Technologically they had second mover advantage. Saved them an absolute fortune.
There are many micro businesses doing good work with just a cell phone started up with just a micro loan. Steemit will take off in these countries as soon as people find out about it. As you say.

"I have been to some remote areas where I could not even find basic amenities for miles but had perfect cell phone coverage !!"

It's a bit like Coke in the 60's. You could go to the most remote place in Africa and find a coca cola fridge?