Android devices now represent 72.4 percent of the cellphone market, according to new third-quarter research data by Gartner. The figure represents a major boost over Q3 2011, when Android had a 52.5 percent share. Some of that ground appears to have come from the platform's closest rival, iOS, which has slipped from 15 to 13.9 percent. Also down are Research in Motion's BlackBerry phones, shifting from 11 to 5.3 percent, and Symbian, shrinking from 16.9 percent to just 2.6.