This is hard to say. Look at the salesman's character. Someone with a better personality? Just to hedge your performance, or fill in your information and secretly get you a credit card. If you have ulterior motives, you may have changed your phone number and mailing address, and the cash in your card has also changed.

Remember in the future, don't just sign the blank form! And a copy of your ID card must be written "XX bank credit card only". If you take your ID card on the spot, write this sentence on a note and put it on your ID card, as long as you don't cover your head and number.

Now, don't worry too much. Do you remember the bank you signed? Remember, if you have nothing to do recently, go to the websites of these banks to check the progress of credit card processing in this section, enter your ID number and see if there are any credit cards waiting for approval. If yes, call customer service immediately, explain that you didn't apply for it yourself and ask for cancellation. As long as it doesn't pass the audit, there is no problem.

Best wishes. Be careful in the future