According to data from the GSM Association, some 109 such deployments had been implemented as of April 2011, spanning all developing regions. Only 11 of these are in developed countries, for perhaps logical reasons.
Mobile payments systems that allow people to use their mobiles as a payment mechanism make the most sense in regions where banking and payments infrastructure is relatively undeveloped.
Africa is leading the trend with 51 mobile money systems in place, and as many as 37 of the deployments are in least developed countries, says the UNCTAD report.
Three broad categories of services now are coming to market. Money transfer services (domestic and/or international) are one type of application.
Payment services (for airtime top-ups, bills, salaries, and other goods and services) are a second type of application.
Use of mobiles to support financial services (savings, credit, insurance) are the third major type of application. Domestic money transfers, airtime and bill payments are the three most common services currently offered. You can view the report here.