If you see a number here but not in the Phone app’s block list, that person can still call you but cannot send SMS or MMS. To fully block them, add them to the Phone app’s list separately.
Would you like step-by-step screenshots for your exact Samsung model and One UI version? how to check blocked numbers on samsung exclusive
If you need to verify if a specific person is blocked, you can do so directly from your address book. If you see a number here but not