Wide Area Telephone Service
（重定向自WATS line）
Wide Area Telephone Service (WATS) was a flat-rate long distance service offering for customer dial-type telecommunications between a given customer phone (also known as a "station") and stations within specified geographic rate areas employing a single telephone line between the customer location and the serving central office. Each access line could be arranged for outward (OUT-WATS) or inward (IN-WATS) service, or both.