How do I change my phone number?

Question

How do I change my phone number and my credit card information?

Answer 1

Could you please share more information? you need to change the phone number to verify the account when you log in to the account? If so, you can do it here:
https://account.live.com/proofs/manage/additional

If that's not the case, please share more information.

To add a new card to your Microsoft account, you can do it here:
https://account.microsoft.com/billing/payments

Take in consideration that to make any of these changes, you need to be able to log in and verify your Microsoft account. Please let me know if this is what you are looking for, and if not, please share more information about this