If the Bank of Communications credit card has been mailed, the credit card center will generally inform you of the registered letter code via text message; if not informed, call the credit card center of the card-issuing bank to inquire about the registered letter number of the mailed credit card; log on to the Bank of Communications website. Inquiry; or call the Bank of Communications customer service hotline for inquiry; most banks will notify the registered letter number by SMS after sending a registered letter for inquiry; in addition, if you need other express delivery, please contact the bank's credit card center in advance and pay 20 Yuan postage is enough.