Symbian OS has several version. The version that ships in volume powers devices like Nokia C1-01 http://store.nokia.com/webapp/wcs/stores/servlet/productdeta... or worse. It's not the same product as iPhone or Android or even the old Palm OS shipped on Treo.
The share of Symbian OS devices shipping a version comparable to iPhone or Android is a blip on the radar. A drop in the ocean. And a peasant among Kings.
Most of Nokia's cheap phones are on the Series 40 platform, which is a closed "non-smart" OS (that has nevertheless grown some fairly smart features recently, like QWERTY keyboards and a HTML browser).
Symbian by Nokia comes in three flavours:
- Symbian^3, the latest and greatest -- e.g. the E7: http://www.forum.nokia.com/Devices/Device_specifications/E7-...
- Symbian^1, the previous touchscreen Symbian version (a.k.a. S60 5th Edition): http://www.forum.nokia.com/Devices/Device_specifications/C5-...
- Symbian S60 3rd Edition, still used on keyboard devices: http://www.forum.nokia.com/Devices/Device_specifications/E72
sign of the first derivative.
The sign of the first derivative only gives you the present rate of adoption/abandonment of the platform, while integrating gives you a measure of success over the platform's entire existence.
how about global market share?
2008: 52.4% of smartphones (RIM 17%, Apple 10%) [1]
2009: 47.2% of smartphones (RIM 21%, Apple 15%) [1]
Android came in at 0.5% and 5% for those two years.
Gartner forecasts that Symbian will remain in the number one smartphone OS position until 2014 when it is contested by Android [2]
Sure, it's in decline now, but it's been a phenomenal success.
[1] http://www.canalys.com/pr/2010/r2010021.html
[2] http://www.gartner.com/it/page.jsp?id=1434613