Chart - American Smart Phone User Share By OS, 2010-2014

This is up 6 percentage points over 2011 and will continue to rise throughout the forecast period, nearing 50% of the total smart phone market by 2014. But Apple’s share is not suffering as a result—in fact, iOS is gaining users as well, though less rapidly. Between 2010 and 2014, eMarketer forecasts Apple’s share of the smart phone market will rise from 28% to 36%, a 29% increase. Read the rest at eMarketer.