Ericsson latest Mobility Report reveals ".. that mobile subscriptions are expected to reach 9.3 billion by 2019, and more than 60 percent of these - 5.6 billion - will be for smartphones. To support the smartphone user experience, WCDMA/HSPA networks are predicted to cover 90 percent of the world's population by 2019. Moreover, almost two-thirds (65 percent) of the world's population will be covered by 4G/LTE networks".
"The largest and fastest growing mobile data traffic segment is video. It is expected to increase by around 55 percent annually up until the end of 2019, by which point it is forecasted to account for more than 50 percent of global mobile traffic".
See "Ericsson Mobility Report: Global smartphone subscriptions to reach 5.6 billion by 2019" - here.