The movement is as simple as it is international. A man pulls out his mobile and goes online. Further down the mountain, a mobile mast peaks out above the brown tree tops, reaching towards the sky in an otherwise deserted part of Africa’s inner plains. Sagara B went online two years ago. In the middle of the small village, the Danish company, Bluetown, erected a mobile mast that runs on solar power and supplies Wi-Fi in a radius of just over 500 metres. Many predict that the internet will give Africa the boost this corner of the world needs. Today, there are more than 300 million smartphones on the continent, but only a third of Africans are online.