Nielsen today became the latest analyst house to call it for smartphones outnumbering more basic devices in the U.S. The company says that in March 2012 smartphones were in use by 50.4 percent of consumers in the country, with Android continuing its domination in the space, accounting for 48.5 percent of all smartphone handsets.

Apple is not a very close second, at 32 percent, but through that percentage it has remained the single-biggest smartphone handset brand.

The 50.4 percentage of smartphones represents growth of about three percent since December 2011, when 47.8 percent of mobile consumers were using smartphones. That seems to suggest that while smartphone penetration continues to grow, the numbers seem to be slowing down a bit in the U.S.

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