Are you in the UK @anarasgarli ?
If you've bought the phone from the UK and then imported it into another country then your issue is that the phone is recognising it's no longer in the UK.
Also is it a phone bought directly from Samsung UK as its needs to be an unlocked version.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.