“The comScore mobiLens survey for the US ending February 2013 shows continuing rapid expansion of smartphone usage in the US,” Horace Dediu reports for Asymco. “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.”

“The growth in smartphones has been driven by the two dominant platforms: iPhone (iOS) and Android. Together they now make up 91% of the user base with about 40% for iPhone and 51% for Android,” Dediu reports. “Android alone gained 17 million users in the last 12 months while iPhone gained 21 million users.”

Dediu reports, “iOS user gains have out-paced Android for the last four periods which resulted in a decrease in Android share of users. A reduction in Android share was also visible in the spring of last year but the current decline is not only longer but more pronounced.”

Read more, and see the excellent charts, in the full article here.

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