Report: Windows Phone has 104% year-over-year growth in fourth quarter

"Apple continues to avoid a low cost smartphone product to target these markets, focusing instead on its traditional premium segment, where growth is harder to achieve due to fast approaching market saturation."-Nick Spencer, senior practice director, mobile devices, ABI Research
Apple's iOS shipped 51 million units in the period to control 18% of the worldwide smartphone market. That works out to a 7% gain year over year and a strong 51% gain sequentially. BlackBerry 10 shipped only1.1 million units in the fourth quarter while the older BlackBerry OS 7 powered 4.2 million phones that were shipped during the three months. Shocking was the 42% quarter-on-quarter growth for the older BlackBerry OS.

Windows Phone doubled the number of units it shipped year over year in Q4
source: ABIResearch via WPCentral