A PSTN offering for discounted bulk long distance service provided over special trunks in the United States and Canada. In the 1970s and 1980s,WATS was highly attractive to medium and large business enterprises that placed large volumes of long distance calls. WATS services were either full-time or measured. Full-time WATS service could be used 24
Wide-Area Telecommunications Service.
A telephone service that ties a customer into the long-distance network through special lines so that calls can be made to, and toll-free calls can be received from, a defined area or areas in large numbers at a special rate.