Operators rarely provide a Federal number for making premium and ppremium SMS.
This is due to many reasons (some technical details and the nuances associated with the service subscribers).
So You have two outputs:
— to create a service on the basis of modem/OS (or rent such industrial service (there are many suppliers, Devin, googling on the phrase Sim hosting)
— rent short number for all operators, or aggregators (cheaper is not even a number, and a specific prefix, in this case to accept messages via http will from the aggregator, and send a can through an aggregator or via external gateways)