Comscore had them at 25% in December, 24.7% in January.

http://www.comscore.com/Press_Events/Press_Releases/2011/2/c...

That report you linked also says that the number of smartphone users is up 60% vs. a year ago. So the negligible decrease of 0.3% is pretty meaningless when that ~25% is now 60% larger than it was a year ago.