Simples Assim

There were 125 million total mobile payment transactions last year, meaning that across the active user base, they send on average 1.4 payments via phone per month, and the average amount of money sent per transaction is 29 dollars.

Not focusing on micropayments is a big mistake now.

http://communities-dominate.blogs.com/brands/2010/02/kenya-nearing-half-point-49-of-all-who-use-banking-services-do-so-on-mobile.html