Nielsen details what apps are being installed in different countries
The apps that are installed on smartphones also vary depending on the region. In the U.S., smartphone users like to watch video and use navigation and mapping apps. In China, news and weather apps are downloaded the most. More than half the smartphone users in South Korea install banking apps on their phones while that number drops to 22% in Italy. A whopping 74% of smartphone users in the U.S. install productivity apps on their handsets while just 1% do the same in Turkey. And while you might think that the U.S. would lead in downloading games, you'd be wrong. Yes, 61% of smartphone users in the States installed games to play on their smartphone, but that was beaten out by the 70% in China that do likewise.
source: Nielsen via Engadget