What does CCB mean by sending SMS upgrade card?

What is the content of the information?

I received a short message about credit card upgrade. After replying according to the content of the message, I will get another card without filling out the application form, which is very convenient. SMS will tell you what card to upgrade and whether the upgrade will affect your original credit card use.

Whether to upgrade or not depends on personal needs. If you think this card is good, or you only have one card in your name, you can upgrade one, so at least you have a spare card, which is good.