The firm's stats might not directly relate to handset sales, but its data drawn from its ad network, which apparently reaches 82 percent of the mobile web has proven a reliable indicator of the ascent of Google's OS.
Millennial's numbers for February, however, show a retraction in Android's share for the first time since June 2010, dropping from 54 percent in January to 51 percent the following month.
Trouble at the top
To put this into context, it means Google's OS still holds the balance of power when it comes to the US smartphone market by some distance second placed iOS also seeing its share also fall to 27 percent but does suggest Android has eaten up as much of the cake as it's likely to get, given the increasingly competitive nature of the market.
What's more surprising is that it's RIM, rather than Apple, that has cause to celebrate. Equally rare as a drop in Android's share is a rise in BlackBerry's, yet that's exactly what the OS achieved in February, up 3 percentage points to 17 percent in Millennial's latest report.
Just why the platform made a mini comeback is unclear (it's not something Millennial itself has chosen to comment on) although RIM phones do make up six of the top 30 mobile devices in the US the first time it has achieved such a feat, increasing its share as the fourth largest OEM in the process.
Portable players
As you might expect, with both iPod touch and iPad doing the business, iOS rules the roost here with 80 percent of the market, Android coming in second with a 17 percent share.
On iPad's broader future, Millennial also cites eMarketer projections, pinning sales of the tablet in 2011 at 15 million, rising to 25 million the following year. Android tablet sales are set rise in much the same manner over the next 24 months, peaking at around 23 million in 2012.
You can read the full Mobile Mix report for February on Millennial Media's website
