Interesting read.<p>I wonder why he didn't include <a href="http://www.canalys.com/pr/2010/r2010021.html" rel="nofollow">http://www.canalys.com/pr/2010/r2010021.html</a> as reference for smartphone share.
Also i think, when he is trying to "guess" the real marketshare, he is underestimating symbian and also i think he is not really aware of the huge divergence of marketshare in different countries all around the world. He assumes what is in the US is true elsewhere which is absolutely not the case. Even more so when talking about featurephones.
For example, Symbian/Nokia has huge marketshares outside of the US, but RIM is much bigger in the US then anywhere else.<p>Unfortunately i don't find the statistics anymore, but the mobile market looks quite different on every continent.<p>edit:
From admob too, but look at the totally different marketshares of symbian and blackberry on the different continents! -> <a href="http://metrics.admob.com/2010/01/december-2009-mobile-metrics-report/" rel="nofollow">http://metrics.admob.com/2010/01/december-2009-mobile-metric...</a>