Apple gained market share in the summer but slipped in the face of tougher competition, according to new IDC data. The iPhone's share of smartphones grew from 16.6 percent to 17.1 percent during the quarter but was overtaken by Research in Motion's record BlackBerry sales, which pushed it above Apple from 14.6 percent to 19 percent. The reversal is credited to the BlackBerry's wider distribution and the launch of a pair of key phones, the Tour and the Curve 8520.
