http://www.cellular-news.com/story/41537.php?s=h

Kenya’s Safaricom, and other emerging market mobile operators, are seeing increasing use of non-voice services as a result of pricing plans that take into account how money is actually earned and spent in developing economies. A Strategy Analytics report points out that Safaricom’s M-PESA mobile funds transfer service handles nearly 10 percent of Kenya’s GDP in transactions that average less than $20.