1. Upgrading a Class II card to a Class I card can be processed through mobile banking and bank branches. Taking China Construction Bank as an example, the mobile banking process is as follows: Log in to the China Construction Bank version of mobile banking, click "Homepage - Account - Account Details - More" and select "Upgrade to Type I Account".

2. Investors can also go to a bank branch with their ID card and a second-class bank account, and handle the upgrade business through bank counters or autonomous teller machines.

3. It should be noted that the same person can only open one Type I account in the same bank. Therefore, the prerequisite for upgrading a Type II card to a Type I card business is that there is no Type I account of the bank under his name. If you already hold a Class I account with the bank, you need to downgrade or cancel the existing Class I account first, and then handle the upgrade business.

2. How to check the type of bank card

1. Many investors have reported that they do not know what type of card their bank has, and they do not know whether they hold an account of the same type. There are many ways to check the bank card category.

2. Users log in to mobile banking, enter "My" and click on the bank card. Some banks will display the account type above the corresponding card number. You can also check the bank card type through text messages. Taking China Construction Bank as an example, edit the text message "CXLX# account number" and send it to 95533 to check. In addition, inquiries can also be made at bank counters or bank self-service teller machines.