Americans have yet to move to a new chip-based card that has users punch in a 6-digit code instead of signing a slip. While the cards are common in Europe, India will, according to the article , adopt them by next year:

The chip-and-PIN technology usually isn’t much of an issue when making purchases at a store, or paying for a meal in a restaurant, as most of those merchants still have credit card terminals that can read the magnetic stripes. Likewise, A.T.M.’s typically recognize and accept many cards whether they have a chip or a magnetic stripe.

But American cardholders have had their cards rejected by automated ticket kiosks at train stations, gas pumps, parking garages and other places where there are no cashiers.