My Apple ID shows a different telephone number

Read this article about managing the information you use with your account --> Manage and use your Apple ID - Apple Support

in particular: Update trusted phone numbers and devices that you're currently signed in to with your Apple ID.

To see, add, or change your trusted phone numbers:

- On your iPhone, iPad, or iPod touch: Go to Settings > your name > Password & Security. Next to Trusted Phone Number, tap Edit.

- On a Mac: 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.

- In a web browser: Go to the Account Security section of https://appleid.apple.com/