AT&T has raised the number of clients in the Greater China region by about 50 percent in 2010, Reuters reported on Thursday, quoting a senior executive of the company.

The telecom major’s revenue from China during the first nine months of last year increased about 21 percent, beating the 13 percent rise it recorded in 2009, says the report.

AT&T, which has been providing communications services to China for more than 25 years, has around 600 companies as clients in China, Hong Kong, Macau and Taiwan, the report says, quoting Johnny Ng, AT&T's general manager for the Greater China region.

The company mainly provides traditional voice and data solutions to multinational business customers through relationships with local telecommunications service providers. AT&T is also one of the major high-speed bandwidth providers for China’s ISPs.

Chinese policy prevents multinational companies like AT&T from directly operating in the country's red hot mobile market.

AT&T's website says it coordinates its operations in China through a wholly foreign-owned enterprise (WOFE) in Beijing and branches in Shanghai, Guangzhou and Shenzhen.