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Sales of the new model, an upgraded version of the firm's flagship smartphone, had doubled in two months after hitting the five-million mark in July, the company said. The new device was released locally on April 29 and in some European countries in May. It also went on sale in China in July before hitting the US market in September. "In just five months the Galaxy S II has seen tremendous growth, reflecting strong support from carrier partners," JK Shin, the head of the firm's mobile device unit, said in a statement.