I'm not sure how much I trust your figures, or how reliable your data is, in relation to the actual reality in the world. I am not saying they are definitely wrong, but you can provide some assurance of why anyone should take your data as being representative of reality?
In a general sense, it is very easy for stats to be wrong or misinterpreted. For example, some people use Opera's state of the mobile web report as somehow indicative of actual handset ownership and usage, when it is obviously just a picture of those users with Opera installed, used, and working internet connections on a phone.
For example, where is your Symbian installed base from exactly? I have seen higher figures than that quoted recently. You may be right and another source wrong, but how can we be sure?
Furthermore, careful with your Nokia featurephone/smartphone figures. Multiple analyst houses have recently classified the entire Asha touch range as being smartphones, and it is clear from a spec comparison that they are indeed fully fledged smartphones, and indeed better specced than many low end Androids. I presume your figures above do no acknowledge any of this.
Furthermore, why no figures for Nokia Store apps, and yet Blackberry is mentioned? Nokia Store is much bigger, with over 6 billion cumulative downloads, over 120,000 apps (clearly bigger than Windows Phone app store yet you make special mention of the latter above). http://www.developer.nokia.com/Distribute/Statist…
Also, be very careful about giving the impression that the whole world is shifting to smartphones rapidly and en masse. That simply is not true. For example Tomi Ahonen's latest data (which has proven perhaps the most reliable in the industry) shows that there are 3.9 billion phones in use in the developing and emerging worlds (vs. 1.6 bn in the rich industrialised world). Of that 3.9 billion only 12.6% are currently smartphones, whereas 87.4% are featurephones. "But they're all going to be smartphones in a couple of years, right?". Wrong. Very wrong. The shift to smartphones of the much, much larger market in the non-rich world, was a grand total of 1% (one percent, no typo) in 2011 and so far in 2012 about 0.6% (zero point six percent) and on course for 1% by the end of the year. So that's a current figure of 3.9 bn total, of which 3.41 bn are non smart, and that is changing at 1% a year. So only 87 years until they all have smartphones (joke, but with a serious point). Low end Android is soundly beaten on almost all fronts by the power and capabilities of featurephones (easily proven fact). My point is, readers of the above chart need to be very, very wary of conclusions they draw from it…
Also, if we the industry step back a moment and see what we are actually looking at in terms of handsets and their true capabilities and usage, we can see very clearly that what we call smartphones are actually just a set of specific brands of phone (iPhone, Android, etc).
And what we call featurephones are clearly fully fledged smartphones in every way, shape and form. They are fully smart and are used as such regardless of what marketing depts, observers, analysts etc decide to call them. There is a real digital apartheid going on with the featurephone/smartphone divide at the moment, and it needs to change asap.