You may need to contact your mobile network provider customer services to ensure there isn't any issue with your actual account @Ozzy32
I don't think a software update would start stopping such connections.
Although it wouldn't harm to take a look in your phone apps settings anyway.
I wish you all the best with this.
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. "