use calling card. you can buy from the website if you have credit card... you can search online for the best deals, usually it cost ~ 2 cents/minute - r6MMCJ|G
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the one I used to use is from a website called cybercalling.com.. you can try it. V6&!
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if you have local chinese grocery store, they sell calling card to China too, and it seems it is much cheaper. 2G67NC?+
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Let me know if you understand what I am talking..I can't type chinese at work.