[change] smartphone usage in africa

From: Arjuna Sathiaseelan <arjuna.sathiaseelan@cl.cam.ac.uk> all, was wondering if there are any data/papers on the smartphone usage in africa - penetration & types of smartphones that are prevalent across the continent? thanks in advance arjuna -- Arjuna Sathiaseelan Personal: http://www.cl.cam.ac.uk/~as2330/ N4D Lab: http://www.cl.cam.ac.uk/~as2330/n4d