To inquire whether the ID card has been used by a credit card, you can inquire in the following three ways:

1. Telephone consultation: Check whether your ID card has been used for a credit card through the customer service staff.

2. Online inquiry: use my ID card and mobile phone to register users in official website, the personal credit service platform of the Credit Information Center of the People's Bank of China; Submit the query application again, and you can see the query results the next day.

3. Local inquiry: Bring your ID card to the credit management center of the local people's bank to print your own credit report.