How can I change my credit card number on my ICloud account

If the new card is valid then set it up.

After that delete the old card.

Read here => Change, add, or remove Apple ID payment methods - Apple Support

Jporter2u Said:

"How can I change my credit card number for my ICloud account"

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Having Issues?

Two Things...

A. Contact your Financial Institution (Bank):

Ask your bank. They may be blocking it out, seeing it as suspicious activity. Happened to me when first using Apple (and still does if purchased in the middle of the night --my time.

Still Need Help?  If so, refer to the following...

B. For Financial Assistance, Contact Apple Store Support:

You need to contact Apple Support Directly. This is a User-to-User forum. We are all volunteers. So, as you may suspect, no one here has access to that information — and that is a good thing, BTW. That’s why for Financial Assistance, you need to contact Apple Support. They’ll see what’s going on and will run you through the fix.

Apple Contact Info:

• Contact Us - Choose Locations
• Proceed from there, as necessary

Why the Wait:

Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :)

I need to update my credit card number.

I have a new Discover card account number for your information. How am I to give this number to you?

I just entered it.