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Will my Indian debit card work in the U.S.?
I recommend that you first try to use your card at a store in your home country, just to make sure that the point-of-sale features are enabled.  After you've verified that, you need to contact your bank and ask them if the card will work in both ATMs and in stores in the U.S.  They may need to enable it to work in another country.  If you are going to be living in the U.S. for a while, you should consider opening an American bank account after you get there. If you don't want a credit card, you should be able to get a debit card here.