에이티앤티(AT&T) - Unlimited Messaging

A national monopoly


In 1968, the Federal Communications Commission allowed the Carterfone and other devices to be connected directly to the AT&T network, as long as they did not cause damage to the system. This ruling (13 F.C.C.2d 420) created the possibility of selling devices that could connect to the phone system and opened up the market to numerous products, including answering machines, fax machines, cordless phones, computer modems and the early, dialup Internet.
From http://en.wikipedia.org/wiki/American_Telephone_and_Telegraph