You could ask for a blank sim card from your network provider and perform a sim swap to move your number and tariff from your current sim to the blank one which should resolve this if it's annoying you @Callum87
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.
Hey everyone. From what I understand, SIM cards contain a temporary number prior to your network assigning a number to them, and on occasion this can result in a read error on the phone where it can't differentiate, so the number shows as Unknown. I understand that it's not ideal, but wanted to assure you that it this issue won't affect your network capabilities, or the functionality of the phone.