Countries with the most smartphone users:
1. China: 845.38 million
2. India: 613.3 million
3. United States: 276.14 million
4. Indonesia: 187.7 million
5. Brazil: 143.43 million
6. Russia: 106.44 million
7. Japan: 97.44 million
8. Nigeria: 83.34 million
9. Mexico: 78.37 million