China has overtaken the US to become the world's most important smartphone market, Strategy Analytics said Wednesday. Where US shipments actually shrank 7.5 percent from spring to summer to fall back to 23.3 million smartphones, the Chinese market grew 57.5 percent just the one season to hit 23.9 million. Nokia, despite its rapid decline, was still the leader in China with 6.8 million Symbian phones, or 28.5 percent, beating Samsung's 4.2 million and 17.6 million.