The comScore mobiLens survey for the US ending February 2013 shows continuing rapid expansion of smartphone usage in the US. Even though the 50% penetration threshold was passed seven months earlier, the rate of new smartphone users was second highest ever recorded with over 1 million new-to-smartphones users every week during February.
Overall penetration increased to 57% with nearly 2% of the population switching in one month. Using the average growth rate for the last six periods, the US could see 80% penetration in another 19 months or by Q3/Q4 2014.