Back in 2005, the World Health Assembly adopted Resolution establishing an eHealth strategy for WHO. The resolution urged Member States to plan for appropriate eHealth services in their countries. That same year, WHO launched the Global Observatory for eHealth (GOe), an initiative dedicated to the study of eHealth, including mHealth—its evolution and impact on health in countries.
Since then, a number of report have been published and represents useful ressources like “mHealth New horizons for health through mobile technologies” (2011).
These documents are available on: http://www.who.int/goe/publications/en/