Have you considered picking up a Payg sim card for your particular network @Julie84 and use that to see if texts etc work OK ?
If your phone model is an unlocked to all Network's version them try another Network's sim payg card.
This is a good process of elimination to rule out the phone at issue.
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 have no affiliation with Samsung.