A savings card is a debit card. You don't need to change it. Debit cards cannot be directly converted into credit cards. Credit cards need to be reapplied. There are several conditions for handling a credit card. First, there are social security cards, other banks' credit cards, ID cards and bank accounts. If it is a VIP of the bank, you can handle it directly. The conditions of major banks are also different. Please consult the relevant bank for details.