Note sure why thats relevant if you are talking about the popularity of an OS in general.
It is relevant, since the popularity of that OS would likely be greatly reduced if there was only one model of phone.. Price is a huge factor in phones, and if you didn't have the cheap stuff, and the one Android phone and the iPhone were the same price, iPhone sales would probably dominate. All speculation, of course, but still probably true. But, we will never know.

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