I want to change my phone number

Assuming you have changed (are changing) your phone number, there are many operations you need to do on your iPhone. This one is a check list (not exhaustive) of things to do:

• Change your number in Settings>Phone>My number...
• Change your number in iMessages & Facetime
• Change your number managing your account and trusted devices (see that particular section) for two factor authentication code:--> Two-factor authentication for Apple ID - Apple Support
• Change your profiles for homebanking app(s) so that they can send you proper codes (do the same for all your signed in application, if needed).
• Send the new number to all (or part of) your contacts.

Regards

Giulio

jerald250 wrote:

I want to change my phone number

You must contact your cellular provider to change your phone number. No one here can help you with that. After you have changed your number please follow the advice of @ProustGiulio above.