Mobile Adoption Forecast (US): Total mobile subscribers and subscriptions including prepay subscriptions. Installed base of mobile handsets segmented by speed (2G, 2.5G, and 3G) and feature set (basic devices, messaging devices, smartphones, and dual mode handsets). Includes only current market share of operating system for smartphones (Apple/iOS, Android, RIM, Windows). Also includes data access subscribers and mobile Internet users. Includes historical data going back to 1997 plus a five-year forecast.