http://static1.businessinsider.com/image/537b72f169bedd1e04384fab-1200-924/smartphoneosmarketshare.png
https://mobiforge.com/files/androidvsiosresize.png
https://image.slidesharecdn.com/mobileinterface-hci-150324072136-conversion-gate01/95/mobile-interface-9-638.jpg
http://www.zdnet.com/i/story/62/72/000422/smartphone-os-mix-chart.jpg