I doubt this data. It totally contradicts with what Gartner said. As the table posted by Gartner Symbian is still #1 in 2010.
I believe the chart posted by LZ is for US market only.
Table 2
Worldwide Smartphone Sales to End Users by Operating System in 2010 (Thousands of Units)
<table border="1" cellpadding="0" cellspacing="0"> <tbody> <tr> <td valign="bottom" nowrap="nowrap">
Company
</td> <td valign="bottom">
2010
Units
</td> <td valign="bottom">
2010 Market Share (%)
</td> <td valign="bottom">
2009
Units
</td> <td valign="bottom">
2009 Market Share (%)
</td> </tr> <tr> <td valign="bottom" nowrap="nowrap">
Symbian
</td> <td valign="bottom" nowrap="nowrap">
111,576.7
</td> <td valign="bottom" nowrap="nowrap">
37.6
</td> <td valign="bottom" nowrap="nowrap">
80,878.3
</td> <td valign="bottom" nowrap="nowrap">
46.9
</td> </tr> <tr> <td valign="bottom" nowrap="nowrap">
Android
</td> <td valign="bottom" nowrap="nowrap">
67,224.5
</td> <td valign="bottom" nowrap="nowrap">
22.7
</td> <td valign="bottom" nowrap="nowrap">
6,798.4
</td> <td valign="bottom" nowrap="nowrap">
3.9
</td> </tr> <tr> <td valign="bottom" nowrap="nowrap">
Research In Motion
</td> <td valign="bottom" nowrap="nowrap">
47,451.6
</td> <td valign="bottom" nowrap="nowrap">
16.0
</td> <td valign="bottom" nowrap="nowrap">
34,346.6
</td> <td valign="bottom" nowrap="nowrap">
19.9
</td> </tr> <tr> <td valign="bottom" nowrap="nowrap">
iOS
</td> <td valign="bottom" nowrap="nowrap">
46,598.3
</td> <td valign="bottom" nowrap="nowrap">
15.7
</td> <td valign="bottom" nowrap="nowrap">
24,889.7
</td> <td valign="bottom" nowrap="nowrap">
14.4
</td> </tr> <tr> <td valign="bottom" nowrap="nowrap">
Microsoft
</td> <td valign="bottom" nowrap="nowrap">
12,378.2
</td> <td valign="bottom" nowrap="nowrap">
4.2
</td> <td valign="bottom" nowrap="nowrap">
15,031.0
</td> <td valign="bottom" nowrap="nowrap">
8.7
</td> </tr> <tr> <td valign="bottom" nowrap="nowrap">
Other Oss
</td> <td valign="bottom" nowrap="nowrap">
11417.4
</td> <td valign="bottom" nowrap="nowrap">
3.8
</td> <td valign="bottom" nowrap="nowrap">
10432.1
</td> <td valign="bottom" nowrap="nowrap">
6.1
</td> </tr> <tr> <td valign="bottom" nowrap="nowrap">
Total
</td> <td valign="bottom" nowrap="nowrap">
296,646.6
</td> <td valign="bottom" nowrap="nowrap">
100.0
</td> <td valign="bottom" nowrap="nowrap">
172,376.1
</td> <td valign="bottom" nowrap="nowrap">
100.0
</td> </tr> </tbody> </table> Source: Gartner (February 2011)