First international trips are expensive enough without losing money to avoidable mistakes. These are the seven most common ones and how to fix each before you land.x 1. Exchanging Currency at the Airport Airport exchange counters charge the worst rates available anywhere. You are a captive customer and they know it. Fix: Withdraw local currency from an ATM on arrival. Use a bank card with no foreign transaction fees. Exchange only a small emergency amount before departure if needed. 2. Not Telling Your Bank You Are Traveling Banks flag unusual foreign transactions as fraud and freeze cards without warning. This happens at the worst possible times — checking into a hotel, paying for transport from the airport. Fix: Call or message your bank at least 48 hours before departure. Most banks have a travel notification option in their app now. 3. Paying for Roaming Instead of Getting a Local SIM International roaming charges from home carriers are extremely expensive for what you get.…