How to add trusted phone number to Apple Account?

From:

Two-factor authentication for Apple Account - 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 > Sign-In & Security. Tap Two-Factor Authentication, tap Edit (above the list of trusted phone numbers), then enter your device passcode when prompted. Add or remove the number, then tap Done.

● On a Mac computer choose Apple menu  > System Settings (or System Preferences), then click your name (or Apple ID). Click Sign-In & Security, then add or remove a trusted phone number.

● Using a web browser:

1) Go to https://appleid.apple.com and sign in.

2) Follow Account Security options until you find one letting you change trusted numbers,

3) Click "+" to add a new number (you may be required to verify this number).

4) If you wish to remove an old number, click "-" next to the number.

Similar information for the iPhone can be found here --> Use two-factor authentication for your Apple Account on iPhone - Apple Support

Please do not include your personal details such as your phone number in your questions. If you HAVE to then censor your number. As that could be a security risk. This is a public platform. And who knows there might be a bad person here who might do lord knows what to your number.

As for adding trusted phone number, open Settings, then Apple Account, then contact information, then add a phone number.

Hope this helps! Stay safe, take care of yourself.