Nielsen study reports the results of the second quarter of 2012 show users a smartphone based on Android and IOS remained popular in U.S. While the smartphone is on the decline is based on Windows and BlackBerry. The collected data shows that users choose to use Android has increased from 51.8% to 54.6% and IOS increased from 34.3% to 36.3%. While the BlackBerry has decreased from 8.1% to 4.0%.