What to ask before taking credit cards overseas
Does my card know I'm traveling?
As soon as you know the dates of your travel, give your credit card company a call and let them know the dates and the countries you will be passing through. Otherwise, those foreign charges may be flagged as fraud and your card will be shut down until you get through to your credit card company.
To guard against any other potential credit card mishaps abroad, bring a backup credit card and, in a separate place, carry a copy of your credit card company's international number in case your card is stolen. Know your credit limit, so you don't find yourself maxed out when the dinner bill arrives at your table.