There is a definite need out there for International Calling Cards. Not everybody has a land line that can call to countries such as India, United Kingdom or Pakistan from their home.
That’s why people often buy international calling cards that are relatively cheap:
Two companies that really worked well for us were the Comfi Calling Cards [...]

We’ve Been Using Vonage Now for about 9 months in our office, and I thought it would be a good time to share our experiences, from sign-up to now.

Calling Overseas, especially India, used to be very expensive. Nowadays, you do not even need to own a telephone line to call overseas - you just need a calling card to call overseas. You can even call from a payphone.