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If your credit-card details may be exposed, contact the card issuer immediately through its official app or the phone number on your card or statement. If the app offers a temporary lock, turn it on while you reach the issuer’s fraud team; a lock is not a substitute for reporting the compromise. Ask the issuer to block or cancel the affected card number, report suspicious charges, and arrange a replacement if needed.

What to do right now

  1. Use an official issuer channel. Open your card issuer’s official app or call the number printed on the card or statement. The FTC advises reporting a lost or stolen card by phone or through the issuer’s app as soon as possible: FTC: Lost or Stolen Credit, ATM, and Debit Cards.
  2. Turn on a temporary lock if available. A lock can restrict use while you contact the issuer, but its features and name differ by provider. The CFPB recommends using a phone-based lock immediately when available for a lost or stolen card: CFPB: Watch accounts closely when card data is hacked.
  3. Tell the issuer your card details may be compromised. Ask the fraud team to block or cancel the affected card number and explain whether it will issue a replacement. If a thief has already charged the card, CFPB guidance says to cancel it and have it replaced before further transactions occur (CFPB guidance).
  4. Report each suspicious transaction. Ask how the issuer wants you to submit a written dispute or other follow-up. Keep copies of messages and documents, and note dates, times, and whom you spoke with. The CFPB says to contact the bank or card provider immediately if you suspect an unauthorized charge: CFPB: Watch accounts closely when card data is hacked.
  5. Keep checking the account. Look for further unfamiliar activity, including small charges, and report anything suspicious to the issuer. If the replacement card has a new number, update legitimate automatic payments and other stored-card arrangements.

Card lock, card cancellation, and credit freeze: what each does

These measures address different risks. A card lock or block is for use of an existing account; cancellation and replacement change the exposed card credentials; a credit-report freeze helps prevent new credit accounts from being opened using your identity information.

Measure What it protects What to do
Issuer lock or block An existing card or account, subject to the issuer’s features. Use the official issuer app if a lock is available, then report the compromise to the issuer.
Card cancellation and replacement The exposed card number or credentials. Ask the issuer to cancel or block the affected number and issue a replacement if appropriate.
Credit-report security freeze Access to your credit file for prospective creditors, helping make it harder to open new credit in your name. Contact each of the three nationwide credit bureaus individually to place a freeze. It is free under federal law.

A credit freeze does not stop charges on a compromised existing card. As the FTC explains, “Even with a credit freeze, a thief can make charges on your existing accounts” (FTC: Understanding Your Credit). Contact the card issuer separately to address the existing account.

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When to place a credit-report freeze

Consider freezing your credit reports if the exposure may include personal identity information that could be used to apply for new credit—not just your card number. A freeze limits prospective creditors’ access to your credit file. You must contact each nationwide credit bureau separately; details are available from the FTC’s credit guidance. A freeze is an additional identity-protection step, not a replacement for locking or cancelling the compromised card.

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What U.S. credit-card liability guidance says

For U.S. credit cards, CFPB guidance distinguishes between a stolen account number and a lost or stolen physical card. If only the account number was taken, the consumer is not responsible for unauthorized credit-card charges. If the physical card was lost or stolen, potential liability can be up to $50 in certain circumstances; the cardholder agreement may provide greater protection. See the CFPB’s explanation, last reviewed April 15, 2024: Am I responsible for unauthorized charges if my credit cards are lost or stolen?

Report suspected fraud promptly and consult your card agreement. These points concern credit cards; debit and prepaid cards can have different protections and reporting deadlines.

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If the exposure involves more than one card

If you suspect broader identity theft, contact the security or fraud departments of affected financial institutions, close affected accounts as appropriate, and use the federal recovery pathway at IdentityTheft.gov. Use verified contact details from an institution’s official app, card, or statement; scammers may impersonate banks and government agencies.

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