This research overviews the Market Share of Android, iOS, Symbian and other Mobile OS products in United States comparing two quarters Y11-Q4 and Y12-Q1. In the last period, Y12-Q1, the largest presented item is iOS with Market Share of 47.02%. The fastest growing participant in our report is iOS with 12.14% growth in Market Share over 2 quarters between Y11-Q4 to Y12-Q1. The topic that suffers from the biggest downturn is Windows Phone with 25% decline over the same period. This report represents data points consolidated from 2 sources: Comscore and StatCounter