Source of book image: http://media.wiley.com/product_data/coverImage300/04/04707432/0470743204.jpg
I was searching for a biography of the entrepreneur Mo Ibrahim who founded the innovative African cell phone company Celtel. The closest I have been able to find so far is Less Walk, More Talk which looks promising, but which I have not yet read.
Arguably, cell phones in Africa have provided important infrastructure that has made it somewhat easier to be productive there, and hence made a contribution to economic growth.
The book is:
Southwood, Russell. Less Walk More Talk: How Celtel and the Mobile Phone Changed Africa. Hoboken, NJ: John Wiley & Sons, 2009.