Due to the advance of information and technology, at this time it is not only the rivalry of handsets becomes hotter, but also the rivalry of operating systems inside the handsets begin hotter too. If we observe the most well known operating systems today are Symbian OS, iPhone OS, Blackberry OS, Palm OS, Windows Phone OS, Windows Mobile OS, Android OS and others. Each of these operating systems has their own awesome features and of course there is no operating system comes perfect. Because of that the developers always develop them again and again.
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