What you are applying for is a credit card (red koi) and savings card (blue, the annual fee is waived for the first year of activation of the card, and the annual fee is 10 yuan every year thereafter, and text messages are currently free)
I personally suggest that you, the cardholder, bring your ID card, the credit (credit) card and savings (debit) card mailed to you, and your mobile phone (preferably a smartphone) to the nearest Bank of Communications branch. Ask the lobby manager to help you activate your credit card and debit card, then activate the "automatic repayment" service on the debit card and credit card, and activate online banking for both cards.
The Bank of Communications lobby manager will explain the above specific procedures and instructions to you in detail.