I want to change the phone number that on this iPhone so I can have a new phone number

You will need to contact your cellular provider to change your phone number.

Hello ~ This is an end to end user forum…you know…people just like you and I trying to help each other with questions and concerns about all things Apple. We cannot change your phone number. If you want your actual phone number changed you need to contact your carrier.

~Katana-San~