Single-Carrier Availability Continues to Hurt iPhone in US as Anroid Surges

Nielsen put out data showing that Android continues to gain momentum and is the leading OS in terms of recent sales. However, the overall market share breakdown is still RIM, Apple, Android in that order (second slide below). But Android clearly has the momentum. 

Yet as I've said before this is not about Android per se -- consumers are not seeking and buying "Android" phones -- but about the growing ranks of Android-powered smartphones from all the leading US carriers: EVO, Incredible, Droid, Fascinate and so on. By contrast, the iPhone is still only available from AT&T; and that obstacle is preventing more consumers from buying it. 

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Android is also benefitting from millions in marketing and advertising being spent by the various OEMs (HTC, Motorola, Samsung) and carriers (Verizon, Sprint, T-Mobile) to promote their respective handsets. Were the iPhone universally available from the major US carriers I'm sure we wouldn't be seeing quite the same Android momentum. 

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Daring Fireball's John Gruber points out that the relationship between Apple and Android in Europe, where the iPhone is more broadly available, is very different than in the US:

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Source: comScore (chart ClickZ)