Mainly at the expense of Windows Mobile and webOS.
comScore's latest figures on US smartphone ownership show Android rising sharply, even though it's only the fourth most popular smartphone OS there.
By the end of January, Android had a 7.1% share of US smartphones - this is all smartphones owned, rather than new sales - up from 2.8% in October 2009.
That growth seems to have come at the expense of Microsoft's Windows Mobile OS, which fell from 19.7% to 15.7% market share in the same period - although note, that still means more than twice as many US smartphone owners than Android.
Top dog RIM saw its US smartphone market share rise from 41.3% to 43% in the same period, while Apple's remained relatively flat, increasing from 24.8% to 25.1%.
Fifth-placed Palm fell from 7.8% to 5.7% - meaning it's now been overtaken by Android. And Symbian? comScore didn't publish Symbian's market share in its research.
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Overall, 42.7 million people in the US owned smartphones by the end of January - up 18% from October.
When it comes to ALL handsets - not just smartphones - Motorola is still the most popular among US consumers, with a 22.9% market share. It's followed by LG (21.7%), Samsung (21.1%), Nokia (9.1%) and RIM (7.8%).
Another factoid from comScore's latest research: the percentage of US mobile subscribers who accessed a social networking site or blog from their phones rose from 13.8% in October to 17.1% in January.
