Nielsen reported Thursday that U.S. mobile subscribers with smartphones has reached 44 percent, led by adoption among those ages 18 to 34.
That is more than double the 18 percent of two years ago and on track to meet Nielsen’s projection that half of American mobile users will have smartphones by the end of 2011. (comScore estimates U.S. smartphone penetration somewhat lower, at 38.5% as of the end of October.)
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