Let me first explain what a calling card is? So when you come to USA and you buy a cell phone service say from AT&T, Verizon or T-Mobile they usually offer you international calling but that comes at a very costly price. Also they don't give you unlimited calls to India and if you want unlimited calls then it may end up making a deep hole in your pocket. So that's why usually everyone in USA who wants to make a call to India or any other international country buys a calling card.
Calling card are usually cheap ( around $5 - $10 a month ) and you get a lot of minutes to talk to your friends and family in India. Usually when you sign up for a calling card they provide you with a pin or a bridge number and then you can dial the India number you are calling to , and can talk to your near and dear ones without any problems.
I have myself tried out many Calling card companies but the calling card service which has impressed me the most is Telcan.
They have currently the lowest rates to make a phone call to India ( $0.016 per minute to call India ). They have 24/7 customer service with a live chat option available so that you have no trouble in making a phone call and connecting with your loved ones.
They also have their Mobile VoIP apps available on all leading platforms : iOS APP Store , Android Google Play ,Windows Phone . You can also access this app via Skype, MagicJack and Gmail and which will save you more money. So basically they have seven different calling techniques and on the top of that they offer free messaging ( SMS ) for each account.
They have a lot of 5 star reviews and and people using this service have stated that they are happy and satisfied using their service. Jut not India they offer their services to make a phone call from USA to many other different countries . To name a few : Afghanistan, China, Pakistan , New Zealand , Australia, Zimbabwe etc. Their rates start from as low as $2 and up to $100.
They also have a refer to friend program where you can refer as many friends as you want and you get $2 as a referral bonus.
Try out Telcan Today - https://www.telcan.com/
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You would also want to look at my article : Best Money Sending Service to India- Online Money Transfers