human
How do I change my iCloud security code verification number on an iPhone?
assistant
Change Your iCloud Security Code Verification Number on an iPhone
1. Open Settings.
2. Tap iCloud, then tap your Apple ID.
3. Tap Password & Security.
4. Tap Add a Trusted Phone Number.
5. Enter new phone number and tap Send.
6. Enter verification code.
7. Tap old phone number.
8. Tap Remove Phone Number, then tap Remove.