Android (operating system) top-selling platform in April 2011, overtaking BlackBerry OS with a 31.2% smartphone share, according to "comScore". By the third quarter of 2011, Gartner estimated that more than half (52.5%) of the smartphone sales belonged to Android. By the third quarter of 2012 Android had a 75% share of the global smartphone market according to the research firm IDC. In July 2011, Google said that 550,000 Android devices were being activated every day, up from 400,000 per day in May, and more than 100 million devices had been activated<ref name="i/o 2011 stats"></ref> with 4.4% growth per week. In September 2012, 500
Nokia When the Lumia 920 was announced in September 2012, it was seen by the press as the first high-end Windows Phone that could challenge rivals due to its advanced feature set. Elop said that the positive reaction to it had created a sense of hope and optimism in the company. The company was also making gains in developing countries with its Asha series, which were selling strongly. Although Nokia's smartphone sales and market share greatly increased throughout 2013, including in the North American market, it was still not enough to avoid financial losses. Ollila stepped down as chairman on 4