District Telephone Company of New Haven, est. 1878, established the first commercial telephone exchange, telephone book, telephone booth (1878), coin-operated phone (1879), and first school for telephone operators (1907)

First telephone book had no numbers, only names of 50 subscribers

Telephonic greetings: Thomas Edison popularized “hello” while Alexander Graham Bell insisted on “ahoy”

One directory advised ending a call with “That is all”

“We have overlooked a wonderfully declarative way to end a conversation. You have said what you intended to say; you now have nothing else to declare, and so you finish your speech without any evangelical flourishes, blandishments you don’t mean, or childish prattle— “That is all.”