The Windows operating system for smartphones is expected to gain market share in the next few years thanks to Nokia, eventually leapfrogging the iOS system used on Apple's iPhone. But Google Android will remain atop the field. That's according to International Data Corporation's latest Worldwide Quarterly Mobile Phone Tracker report. IDC predicts Android will have 43.8 percent of the market in 2015, followed by Windows Phone at 20.3 percent. Apple's iOS will trail at 16.9 percent. The future projections would be a significant improvement for Windows Phone, which will account for just 3.8 percent of the market by the end...