Hi @Anonymous User.
What model of phone do you have? Have you changed your number from this number to a different one, and is this the number you used to have with your phone? (We've hidden the number for security purposes).
I think your phone will ways pick up the first number that was associated with the number on the SIM card.
One way to possibly change this is to have your current number SIM swapped onto a blank SIM card which your network would have to do. Usually in their Network Highstreet Stores.
Current Phone ~
Samsung Note 20 Ultra 5G SM-9820 _256Gb SnapDragon 865+
Samsung One Ui 2.5/ Android 10.