Hi!
My name is Mihály!
It would be nice to have possibility to setup the message center number!
In that case if your phone and your provider supports the VoLTE function and it is switched on in the phone, then you subscribe to the SMS service, when you are connecting to the network.
But if it is not supported one of the party, it is necessary to have the right message center number in the phone.
Normally it is on the SIM card, but it is not always the case.