According to our Country Share Tracker (CST) service, China smartphone shipments increased +61% YoY in Q3 2012, surging way ahead of the United States and confirming its position as the world's largest country by volume. Samsung stayed top, but Lenovo is second and closing the gap. Huawei, ZTE and Coolpad continued to jostle for the remaining top-five slots. Almost all the "big 10" smartphone brands in China now use Android, putting pressure on Microkia and Apple iPhone. More analysis and data can be downloaded by clients in this published report.