I have been to Africa. Its quite big. Most people have the regular nokia phones. But there are still a large number of people (tens of millions) with smartphones. And the most popular smartphone appears to be the blackberry. It completely dominates. Maybe because the networks bias their dataplans towards the blackberry and maybe the messaging, I don't know. And there is peer pressure. My android phone was looked at with scorn and there were many helpful suggestions to switch to the blackberry to which I had to constantly explain that I was happy with my phone. The android tablets fare better though.
Could it be Blackberry is popular because of the free "ping" service? At least that is what seems to drive the mass adoption of them (and the peer pressure) among teenagers here in the Netherlands: the free unlimited "texting" with other Blackberry users.