Smartphone Volumes Expected to Rebound in 2017 with a Five-Year Growth Rate of 3.8%, Driving Annual Shipments to 1.53 Billion by 2021, According to IDC http://www.idc.com/getdoc.jsp?containerId=prUS42334717 Move Over PCs, Sales of Smartphones to Reach 1.5 Billion in 2016 http://www.androidauthority.com/smartphone-sales-statistics-vs-pc-58687/