How to change Apple ID phone number?

If you want to add or change the trusted number to receive verification codes then sign into https://appleid.apple.com/account/manage and edit the trusted numbers section

You may --> Use your mobile phone number as your Apple ID - Apple ...

Watch the GIF below

You forgot your own phone number? Ask one of your friends, it is in their contacts.

You lost the SIM? borrow a phone and ask your phone company for a replacement with the same number.

Put that in your new phone.