Where will the card not been accepted, even they accept creditcards?
The card cannot been accepted, wherever the store got no online-connection to the card-processor and the coverage of the purchase cannot been approved. E.g. wherever the old creditcard-imprinter is still in use and you have to sign the sales slip and cannot enter the PIN by a numberpad (in taxi, at a basar, on the beach, …..) this card won’t be accepted.