On my favorite statistics site for IT, you find some useful information about market shares of browser, operating systems and so on. There is also an option to show the shares in a world map. If you take a look at the picture below you see the number 1 mobile operating system used in the respective country.
It’s interesting, that iOS seems to be the most popular OS for mobile phones in English-speaking countries and just a few other countries in Europe (France, Scandinavia, Switzerland). In most countries, people are using Android, South America is dark pink in this context. Just in Africa, Series 40 is widely spread which is an operating system invented by Nokia for their cell phones. Interesting, how things will change in the future, stay in touch!