Have you ever been supplied a sim card with a temporary number assigned to it and then had your own number transferred to the sim as this is the typical cause.
Do you recognise the number showing ?
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Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
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Exactly same issue for me on S10e. Temporary number still displayed after my old number was transferred over a month ago. No solution from Samsung Support.
@Marijasmin: Are you still able to access your network features (calls, texts and mobile data)? If so then please disregard this as a read error, as Settings > About Phone > Phone number will sometimes display the SIM card's temporary number, or show 'Unknown number' instead of the correct information. If this is of concern, then I recommend reaching out to your network provider to request a SIM swap to see if this resolves the issue.