Here US, some stores when using a chip credit card (not debit/checking account btw) requires a pin instead of a signature, not sure if they call it a pin but it's 4 digits to verify purchases . . . instead of signature.
I have a MasterCard that takes a pin. I've been asked to enter the pin at several places, including WalMart. It is a credit card, not a debit card.
Frankly, I'm baffles by these claims that US cards don't work with chip and pin because so far, if I use the chip, I have been required to use the pin.
I also have a corporate amex with a pin set up, but I've never used it.