Various studies in the last few months have suggested that about half of US adults have and use smartphones. Nielsen reported passing the 50% penetration level in March, while Pew had penetration at 45% in a September report. Both of those numbers were based on projections of survey responses. ComScore, on the other hand, bases its projections on actual online activity metrics - so it should be a better measure of actual use. The most recent comScore report has smartphone penetration among US adults at 51%. That's also supported by the number of people making use of key mobile activities. comScore puts SMS use at 75.8% (although not a smartphone-only activity), use of mobile apps at 54%, and mobile Web browsing at 52%. They found that two more targeted mobile activities (ones not all smartphone owners are likely to use) were used by more than a third of adults - social networking at 39.6% and mobile gameplaying at 34.4%.
Some analysts also noted that the growth rate in smartphone adoption has slowed somewhat - but that's something that' diffusion of innovations theory suggests will happen in the latter stages of diffusion.
Sources -
comScore: Smartphone Penetration Hits 51%,
MobileMarketingDaily
comScore Reports September 2012 U.S. Mobile Subscriber Market Share, press release, comScore
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