According to Gartner group, Linux based smartphone sales went DOWN in 2009 (~8.1 million units) compared to 2008 (~10.6 million units). Meanwhile iPhone OS more than doubled the number of sold units, from ~11.4 to ~24.9 million, which was also the greatest growth in absolute sales numbers for any smartphone OS, Android OS enjoyed over a 10-fold increase from ~.64 to ~6.8 million units sold.

http://www.gartner.com/it/page.jsp?id=1306513