India leads the world in the number of users accessing the interest using their smartphones as shown in the chart below:

Click to enlarge

Note: The European Union is in the G20, but not all countries in the EU are in the chart.
Source: StatCounter GlobalStats, February 2017

Despite the lead, only 18% of the Indian population had a smartphone in 2016. Smartphones are still more common in the developed world than in the emerging world.

Source: A Megatrend is Underway, Thornburg Investment Management, Inc.