Forty percent of adults mobile phone users in the USA now have smartphones, according to July 2011 data from Nielsen.

Android is the most popular operating system, with 40 percent of mobile consumers reporting they have a smartphone with an Android OS. Apple's iOS is in second place, with 28 percent of the market.

Among those who say they are likely to get a new smartphone in the next year, approximately one third say they want their next smartphone to be an iPhone and one third say they want a...