When setting up new 15 pro the phone number for cellular came over as the number of the person who ordered this gift for me.
I need to change the phone number to my own. All data that transferred is correct except for the phone number
If that’s what happened the person whose number it is no longer has use of that number, as a cell phone number can only be associated with one phone. You need to contact your carrier and ask for them to provide a link or QR code for eSIM with your number.