IDC Reports Worldwide Smartphone Shipments For First Quarter 2013 16 May 2013 bzamayo.com/idc-smartphone-first-quarter IDC, via Business Wire: Windows Phone posted the largest year-over-year gain among the leading operating systems, more than doubling its size from a year ago. Nokia was largely responsible for driving these volumes higher, accounting for 79.0% of all Windows Phone shipments during the quarter. Since Nokia began shipping Windows Phone devices, the company has shipped a total of 20.3 million units and grown the footprint worldwide to include address multiple market segments. Meanwhile, other vendors continue to offer Windows Phone devices, but mainly as an alternative to their signature Android devices. Still, the gains made by Windows Phone demonstrate both end-user demand and OEM support. Windows Phone outshipped Blackberry.