If you suspect that you have been issued a card without knowing it, you can take the following measures to find out:

1. Check your personal credit report: Your personal credit report reflects your personal credit An important tool for checking your credit status is to download your credit report from the credit information agency or the bank's official website to see if there is any unknown credit card or loan information.

2. Monitor bank accounts: Check your bank account regularly to see if there are any unknown transactions or expenditures, especially transactions related to credit cards. If any abnormalities are found, contact the bank or credit card issuer in a timely manner.

3. Pay attention to credit card bills: Check your credit card bills promptly every month to confirm whether your consumption records and bill amounts are correct. If you have any questions, contact the credit card issuer promptly.

4. Log in to the bank website or mobile banking APP: Check your credit card information through the bank website or mobile banking APP to confirm whether there is any unknown credit card or loan information.

5. Consult bank customer service: If you suspect that you have been issued a card, you can consult bank customer service to learn about your credit card information and account status, and request the card to be frozen or canceled to prevent unnecessary economic losses.

If no abnormality is found through the above measures, you can use your credit card with peace of mind and pay attention to protecting personal information and account security.

The above are all my answers, I hope they can help you~