When I access About Phone in Settings My Phone Number is shown as Unknown How do I change this setting?
Launch Contacts App.
Tap your info at the top
Then press ' edit ' at the bottom left hand side of the screen.
Type in your number in the phone field.
If this does not work then its possibly a sim driven issue i.e. if a person has used a network blank sim card to transfer their number from one sim to another or used a temporary number while a network Pac their number from one network to another.
My advice comes from being a UK Samsung Phone Owner.
I have no affiliation with Samsung.
Current Phone ~
Samsung Note 10 Plus 5G _256Gb >_ Samsung One Ui 2.5/ Android 10.