relianceindiacall.com is the best if ur calling from US to india . its very easy to use as all u need is to to their website and subscribe to the service .its damn cheap 10 $ u can talk for 77 minutes and a 25 $ deposit will let u talk for 200 minutes!!! ie 8 minutes for 1 $ !!! or less than 6 Rs /minute.
i have tried various calling cards, by far the best what i found is the new call2india offer by relianceinfo.com. its cheaper compared to everything else i tried and they dont have any hidden charges.
u can try it out for just $5. it also offers PIN less dialing.
hope it helps
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