So finally, Linux has showed it's quality. Android and Linux together now has almost 2/3 of the total market share.
Perhaps linux is best used on new types of hardware, when you need a new operating system for an application in a hardware that has not really been used for very long. The open development probably catches a lot more bugs than closed ones, so it probably works very good when it is ported for other purposes.
It is nice to see how free software can make an entrance like this. It is not far from that you some day can choose your operating system when buying your phone. Maybe you can even buy many phones without any software at all in a few years, and install it yourself. If not, someone should really try to come up with an idea that makes phones equipped with open source software that is free and functional.
Android - Googles Linux based operating system.
iOS - Apples operating system.
Symbian - Previously Nokias, now Accenture develops it.
Linux - Means samsung Bada and Meego/Tizen. Even though Android could also be counted in here.
Windows - The microsoft operating system.