Although NPD didn't dig into each vendor's market share on the quarter, the company did discuss Motorola Mobility. The research firm said that the handset maker's overall mobile-phone market share declined in the second quarter from 12 percent last year to 9 percent this year. In the smartphone space, Motorola Mobility's share dropped from 15 percent to 12 percent. Perhaps most concerning for the company, its Android market share hit 22 percent during the period, down from the 44 percent ownership it had during the second quarter of 2010.