A week after it started rolling out, Pokemon Go has crossed the 10 million installs milestone on Android - the app's Google Play page currently shows the number of installs in 10,000,000 - 50,000,000 range. While that's certainly impressive, do keep in mind that the figure represents the total number of installs, meaning the number of Android devices that have the game installed, and not necessarily the number of people who are actively using the app. The total number of downloads on iOS, however, isn't currently known. Talking about the US market, reports reveal a total of 7.5...
Source: http://www.gsmarena.com/pokemon_go_now_has_over_10_million_installs_on_android_alone-news-19368.php