If you lose your credit card, you can't fill in your phone number. If the credit card is lost, you need to contact the issuing bank or credit card institution to report the loss and reissue the credit card. The way is as follows:

1. Back of the credit card: The contact number of the bank will be printed on the back of the credit card. You can check the back of the card and find the corresponding contact information.

2. Bank official website: Log in to Bank official website to search for information on loss reporting of credit cards, and the corresponding contact number will be provided.

3. Bank customer service hotline: Call the customer service hotline of the bank corresponding to the credit card used to ask the customer service staff about the loss of the credit card, and obtain the process and contact information for reissue the credit card. Credit card is a financial tool, which is a payment and credit tool issued by banks or financial institutions. Cardholders can use credit cards to shop, pay bills and conduct other consumption activities in stores, online and other places.