Rebtel announces low cost and free international calling to and from China. Starting Friday, December 21, residents of Shanghai can use their mobile phones to call any phone, anywhere in the world for just pennies per minute, and make free calls to friends, family, and work colleagues in 39 countries.

More than 18 million people live in Shanghai. And that doesn't include the city's 6 million migrant workers, making Shanghai one of the most populous cities in the world.

Rebtel's low-cost calls from Shanghai to the United States, for example, will cost just $0.018 per minute; $0.019 per minute from the U.S. to Shanghai. By comparison, AT&T charges $3.50 per minute to call a mobile phone in China from a mobile phone in the U.S.

Rebtel calls from Shanghai will cost $0.019 to U.K. landlines, and $0.18 to U.K. mobile phones. Using Rebtel to call Shanghai from London will be the same as from the U.S.: $0.019 per minute. In contrast, Vodafone charges $3.33 per minute to call Shanghai from the U.K.

Rebtel services can be used with any mobile phone without modification or software downloads. There is no charge to set up a Rebtel account. All new comers get a free 10 minute call to test the service. Thereafter, subscribers only pay for the minutes they use. Smart Calls between the 40 counties served by Rebtel are always free and only one of the two people on a call must be a Rebtel subscriber.