SK Telecom Co., South Korea's largest mobile-phone operator, will help China develop its own standard for wireless networks, seeking access to the world's biggest cell-phone market by subscribers, Bloomberg reported. The alliance is the first that China's government has signed with an overseas operator for the third-generation technology known as TD-SCDMA, which allows faster downloads of movies and music, the Seoul-based company said in a statement. SK Telecom bought 1 billion US dollars worth of bonds convertible into shares of China's second-largest mobile-phone company in July. China's homegrown standard needs to win customers to compete with rival technologies developed by Nokia Oyj and Qualcomm Inc. China ``can benefit from the experience of a foreign operator,'' said Bloomberg, quoting Kelvin Ho, a telecom analyst at Nomura International (Hong Kong) Ltd as saying. The agreement may ``help faster development of the TD-SCDMA standard in China.'' As part of the agreement announced today, SK Telecom will test TD-SCDMA in South Korea by the second half of next year, the statement said. China plans to start the 3G service before the start of the 2008 Beijing Summer Olympics, according to the statement.