The survey reflects smartphone ownership for a three month period ending in late March. Overall smartphone ownership increased from 21% to 23% compared to the previous three month period.
The surprise stat in the survey is likely Android's placement. While gaining two points, Android is still well behind Windows Phones with only a 9% share of the market. With the popularity of Android devices and all the doubt surrounding Windows Phone's future, one would think the numbers would be reversed.
I reckon' Windows Phones aren't dead just yet.