Go to the Contacts app, click on your name, then click on Edit and then update your phone no. and Save. Go back to About phone and check if the number has been updated.
And if this does not work, then best to request a new sim card.
If your network assigned you a temporary number while they ported your own number from a previous network vua a Pac then the phone could be picking up the original temporary number.
Ask your local Highstreet Store to perform a sim swap to a blank sim card as the blank sim card will never had a number associated with it.
I wish you all the best. 😎
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "