ComScore's U.S. smartphone figures show Microsoft on the decline and Google's Android on the rise. The firm's market share trends for February show Research In Motion's BlackBerry platform retaining the No. 1 position and Apple's iPhone OS continuing to fill the No. 2 slot. Microsoft's market share fell from 19.1 percent in November to 15.1 percent in February, while Android jumped from 3.8 percent in November to 9 percent in February, according to comScore.