qnli question: In what year did the Southern New England Telephone Company, formerly the District Telephone Company of New Haven, establish operations in the area? sentence: The Southern New England Telephone Company (SNET) began operations in the city as the District Telephone Company of New Haven in 1878; the company remains headquartered in New Haven as a subsidiary of AT&T Inc., now doing business as AT&T Connecticut, and provides telephone service for all but two municipalities in Connecticut.