Previous telecommunications systems — most notably the phone system — are regulated as “common carriers”. This means you can call whoever you like; you can use whatever phone you want; and anyone in a service area can sign up at a fair rate.
This designation recognizes that communication systems are too important to be left to the vagaries of profit-be-damned executives and that the operators are in very powerful positions to do harm and extract tolls.
via How the FCC Plans to Save the Internet By Destroying It: An Explainer — Medium.