According to Query Branch Encyclopedia, common methods to check whether a credit card has been activated are as follows: 1. Log in to online banking. If your credit card has been successfully activated, you can try to log in to online banking and check the status of the credit card. Account information and credit limit, etc. If you are unable to log in, it may be because your credit card has not been activated. In this case, you need to contact the card issuer for activation. 2. Call the customer service hotline. You can call the customer service hotline of the credit card issuing bank to ask whether the credit card has been activated. During the call, your credit card number and personally identifiable information will be required for verification. 3. Email notification: Some credit card issuers will notify you via email or SMS that your credit card has been activated. If you receive such a notification, your credit card can be used normally. No matter which method you use, it is very important to check whether your credit card is activated to avoid unnecessary trouble and losses.