Apple grabbed 13.3% of the worldwide smartphone market in the second quarter, according to the latest data released by Gartner. While overall mobile sales declined 6%, smartphone sales grew 27%, helping Apple to reach third place on the list of handset manufacturers, behind only Nokia with a 45% share of the market—down from 47.4% in the year-ago quarter—and BlackBerry maker Research In Motion, which gained 1.4% year-over-year to capture…