
So these platforms died, and the world of mobile operating systems is now binary: only iOS and Android have been competing for the last few years. Symbian, BlackBerry OS, and Windows Phone ultimately proved less popular than iOS and Android, and supporting them didn’t pay off. Developers released their apps on the operating systems that were most popular among their target audiences and ignored less popular OSs.

The development process a decade ago was much harder and more expensive than it is now. However, the variety of operating systems was a real challenge for software developers, who had to build a whole new app for each platform they wanted to support.

There was Windows Phone, BlackBerry OS, and Symbian along with the now well-known iOS and Android. The mobile phone operating system landscape was much more diverse 10 to 15 years ago.
