Maybe the only popular one, but certainly not the only one. In fact, only webOS is (was, I guess) locked to a single company. Windows Phone isn't open source, but there are at least four hardware manufacturers. Nokia's MeeGo is open source (and quite good on my Nokia N9). And, soon, webOS will be too. So, while Android is a more open mobile OS, it certainly isn't the only one.
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Maybe the only popular one, but certainly not the only one. In fact, only webOS is (was, I guess) locked to a single company. Windows Phone isn't open source, but there are at least four hardware manufacturers. Nokia's MeeGo is open source (and quite good on my Nokia N9). And, soon, webOS will be too. So, while Android is a more open mobile OS, it certainly isn't the only one.