According to the analysts over at Gartner, Android will be the most popular mobile OS in the next four years reaching almost 50% market share. Meanwhile Windows Phone will catch up and overtake the second place from iOS by 2015 with 20% market share.

This is what the latest Gartner's report predicts. Quite expectedly the Symbian market share is shrinking rapidly, while those of Android's and Windows Phone will go up.

Apple's iOS will have the second place by the end of 2012, but Microsoft will...