As a process of elimination can you try your sim card in another phone and then see what happens which can help to rule out a phone , sim card kr network account related issue.
If your settings are set to allow usage then I'm not confident this has to do with your phone.
If I can be of any further help then please don't hesitate. Take care. 😎
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. " This is the way. "