Accoriding to an article from humanipo.com

Bluegrass Digital is a South African web solutions company and Hawkins said the importance of mobile on the continent is “magnified” because the majority of Africans only access the internet through their handsets.

“Added to this, the variety of gadgets that middle and higher income consumers have to choose from is expanding at a rapid pace,” said Hawkins.

“Instead of being limited to a stationary desktop PC (personal computer), consumers can arm themselves with sleek notebooks, feather light laptops, tablets, phablets, and of course, the ubiquitous smartphone.”

Source: http://www.humanipo.com/news/34041/the-importance-of-mobile-first-responsive-web-design-in-africa/