Apple's deal to introduce the iPhone to the Chinese market figures to be a huge opportunity, with one analyst projecting that sales of the popular device in China will account for 20 percent of the company's global handset revenues next year.

After forging a partnership with China Unicom last week, Apple (NASDAQ: AAPL) will sell between 5 million and 7 million iPhones in China in 2010, Brian Marshall, an analyst with Broadpoint AmTech, told InternetNews.com.

On Friday, China Unicom, that country's No. 2 carrier, announced a three-year agreement with Apple, in what Marshall said is a "big win for Apple, a huge opportunity."

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