By mobile, we refer to all technologies that enable voice and data services via cellular connectivity, including second generation (2G), third generation (3G), and fourth generation (4G) networks. With each leap forward in the core technologies, new digital services come online with the potential to transform fields that have massive social and economic impact, such as health care, finance, and education. Indeed, for consumers, small and medium-sized enterprises (SMEs), and the economy as a whole, mobile is a global success story. Revenues across the mobile industry have grown at 13 percent year on year since 2009—more than twice the rate of the global economy over the same period.