Hi javeriayounes,
The cellular operating system environment is getting more, not less, confusing.
There are a variety of Android versions, plus different "skins" and graphical user interfaces on Android. Then we have the new Windows Phone 7, Samsung's bada, various versions of Nokia's Symbian OS and the Nokia/Intel MeeGo.
Then you combine that with phone operating systems that have evolved into software for other devices, such as Android on tablets and a version of the iPhone OS, now iOS, on the iPad.
No wonder consumers are confused...if they even know what OS their device is running.