Prior to traveling abroad, I call all my credit card companies to alert them of my travel locations and travel dates. This way, my purchases abroad won’t be denied. Additionally, I confirm that my credit cards don’t add a foreign transaction fee. The cards that do carry the foreign transaction fee (usually 3%), I take out of my wallet and keep them at home until I return from my trip. It is not worth it to be charged an extra 3%!
On my recent trip to Asia, I called and verified which credit cards to bring with me. I had a plan for exchanging currency for the restaurants that might not take credit cards. Yet I still made a mistake!