eMarketer, which bases its forecasts on analysis of research estimates and methodologies from multiple firms who monitor the smartphone market, estimates Apple took a 28% share of the US smartphone user market in 2010, just above the 24% of users who use a device running Android .
RIM’s share of the market is expected to decline to 25% in 2011, down from 30% in 2010.
eMarketer predicts that Google’s Android platform will continue to gain share through 2012, with 31% of all smartphone users owning an Android-powered handset (up from 6% in 2009).
By then, Apple’s market share is expected to clock off at 30%, up only slightly from 2009.
In the words of Noah Elkin, eMarketer principal analyst and author of a forthcoming report on mobile devices:
“With a growing roster of manufacturer and carrier partners in every major market and market segment, scale for Android is coming quickly in terms of device, market share, apps and ad revenues.”