Nokia will begin selling its new line of Lumia phones in China next month.  The company is hoping that the product introductions will build momentum for Lumia Windows phones in China and other countries.  The Lumia phones will be sold through one of the country’s largest mobile operators.  Nokia is also planning to begin selling Lumia phones in the United States and Latin America later this year. Nokia previously announced plans to phase out smartphones using its own Symbian operating system...