Verify Apple ID using two factor authentication
change My number in my iCloud email
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This is from the section "About trusted phone numbers and trusted devices" in the article: Two-factor authentication for Apple ID - Apple Support :
To see, add, or change your trusted phone numbers use one of these methods:
● On your iPhone, iPad, or iPod touch: Go to Settings > your name > Password & Security. Next to Trusted Phone Number, tap Edit.
● On a Mac computer choose Apple menu > System Settings (or System Preferences), then click your name (or Apple ID). Click Password & Security, then add or remove a trusted phone number.
● Using a web browser: Go to the Account Security section of https://appleid.apple.com .
If you set up an Account Recovery Contact ( Set up an account recovery contact - Apple Support ) you can also get a code that way.