Imagine checking into a hotel only to find out your credit card accounts have been frozen. Your card issuer will often block your card if unusual activity appears on your account. This is to help protect you and minimize possible fraudulent activity. So, be sure to call your credit and debit card issuers ahead of time to let them know you'll be out of town--especially if it's an international trip. That way, you won't be blocked from using your credit cards when you need them most.
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