I did a year of travel worldwide in over a dozen countries, and I had the most problems using my credit and debit cards in India. Particularly online, even at

I did a year of travel worldwide in over a dozen countries, and I had the most problems using my credit and debit cards in India. Particularly online, even at large, legitimate businesses like major airlines. It becomes a tense situation when you are trying to buy a flight that you absolutely have to take, and despite 4 different credit/debit cards you still can't get any purchase on multiple different airlines go through! I even tried to go to the offices, but they were often difficult to find, non-existent, or just not open at the times you'd expect them to be. And good luck trying to purchase on a telephone, between trying to dial in international number, bad connections, and language issues! FWIW, I had the most success with debit cards. I suspect it's because international companies feel more comfortable with cash in hand, vs. an American CC which can be easily charged back.