iPhone OS? Symbian OS? What is the future of the Mobile Phones?

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Hi All, A lot of peoples using iPhone OS (Which is quite good), On the other hand, Many peoples slowly start threating of leaving it and start another OS. Symbian on the other hand, Is started to get quite massively on the new Nokia phones and one few other ones such Samsung and few more. So my question is, What is the future of the Mobile Systems? iPhone is going to die? Symbian Taken over? Or Microsoft will improve Windows Mobile?