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As is well known, our mission is to organize the world's information and make it universally accessible and useful. We aim to do this through technology, and in Africa, that means developing tools for the mobile phone. Africa has the world’s highest mobile growth rate. Mobile phone penetration is six times Internet penetration -- one third of the population owns a mobile phone and many more have access to one. Most of these devices only have voice and SMS capabilities, which is why we have chosen to focus our initial mobile efforts on SMS.
Official Google Mobile Blog: Designing SMS apps for mobile Africa