Nielsen release US mobile market statistics for Q1 2012
U.S. smartphone ownership has passed the halfway point, with 50.4% of mobile users now owning smart devices, up from 47.8% in 2011. While the Android OS is found on almost half of all smartphone devices, it's Apple who are the number one handset manufacturer so far in 2012.
Nielsen have also published results regarding smartphone ownership amongst various ethnic groups.
It also seems that women are slightly ahead of their male counterparts in smartphone usage, with 50.9% of females owning smartphones compared to 50.1% of men.