From the data findings by analyst company Canalys, while Nokia and Microsoft shares are decreasing, RIM and Apple are growing:
The above stats are based on the number of units shipped during Q2 of 2009. The iPhone 3G was not yet out when the data was gathered. Android-based smartphones where not available in the second quarter of 2008. By this time next year, Android will be much closer to Microsoft's share. Nokia just came out with its Maemo-based smartphone, the N900. Moving more towards Maemo rather than hanging on to Symbian might actually work out pretty well for Nokia in the end.