Sorry, I don’t know any cheap way to call India. For some reason, it’s always very expensive to call undeveloped countries like India, Vietnam, Cambodia, Laos, Burma, etc. But for calling other countries in Asia, I found a card at this website that lets you call these countries for less than 4 NT per minute:
Singapore: 1.5 NT
Japan: 2.0 NT
South Korea: 2.0 NT
Malaysia: 2.5 NT
Hong Kong: 3.0 NT
For all other countries, the price is more than 4 NT per minute, so it’s cheaper to use 0951-300-888 or one of the 0943/0947 numbers that I wrote about earlier.
And here’s the price for countries outside of Asia:
USA: 2.0 NT
Canada: 2.0 NT
Australia: 3.0 NT
New Zealand: 3.0 NT
Most Western European Countries: 3.0 NT
The card is called “Intercall”. Actually, Intercall sells lots of different cards. This website lists all of the different Intercall cards.
Using an Intercall card isn’t as simple as using the 0951 and 0943/0947 numbers, though, because you have to fill out a form to order a card, and the cards cost either 500 NT or 1000 NT each. Then when you get the card, you have to first dial a local phone number, and then when you hear the recording, you enter your account number and password, and then dial the number you want to call. So you get charged for a local phone call in addition to the above charges, but the price for a local phone call is only 0.30 to 0.53 NT per minute, depending on which “plan” you have. (It’s 0.30 NT for the “C” plan, 0.32 NT for the “B” plan, and 0.53 for the “A” plan. The “A” plan is the default plan if you don’t tell the phone company that you want the “B” or the “C” plan).
By the way, the charges that I wrote above is for the “Asia card”. Intercall has another card (at this website) which is only 1.2 NT for calling USA or Canada, but with that card, it isn’t quite so cheap to call Asian countries. (See the rate chart here.)
Intercall also sells an “Australia and New Zealand card”. If you use that card, it’s only 1.5 NT per minute to call Australia or New Zealand. And they also have a “Europe card”, which charges only 1.5 NT per minute to call most western European countries. You can see all the different cards at this website.
I’ve never tried using these cards before (I always use 0951-300-888), so I’m not sure how good the sound quality is, but this is the only way I know to call overseas for less than 4 NT per minute unless you use the internet.