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Now no one offers free calling cards just for nothing in return. But his website has been around for atleast past 5 to 6 years which offers free minutes .. local and international (international cards take out more points form your account). It used to give away free minutes on signup but now I guess with the economy things have changed !! There are lots of offers on the page and for some of them you do not have to provide a credit card or anything. Just visit a few pages and you will get enough minutes to call anywhere around the world. The site is called phonehog and this is the link: call free
Be careful, do not just sign up just to get minutes ... minutes for US to US calls are just 1 to 2 cent per minute.. and from US to India costs less than 10 cents per minute on most calling card websites. So do not compromise your privacy or sign up giving away your credit card just to get a few free minutes.