The phenomenal sales of Apple's iPhone 5 helped boost the Cupertino company to its highest ever share of US smartphone sales over the past 12 weeks. This according to Kantar Worldpanel ComTech, which released a new analysis of the US smartphone market over the past three months, finding that the release of the iPhone 5 caused Apple's share of sales to jump to 53.3 percent in the United States, and this largely at the expense of iOS' main competitor, Google's Android platform. Year-over-year, iOS sales share was up 17.5 percentage points, while Android's share dropped 10.9 points.