Telephone exchange names UK in 1966, although it was not until the early 1970s that all exchange names were converted. In Paris and its suburbs, the conversion from 3L-4N to all numbers occurred in October 1963. For example, ÉLYsées became 379, LOUvre 508, PIGalle 744, POMpadour 706... But until October 1985, when an 8th number was added, it remained possible to make use of almost all the previous combinations. At least four popular songs use old telephone exchanges in their names: "PEnnsylvania 6-5000" (PE 6-5000), recorded by Glenn Miller (the inspiration for that song, the Hotel Pennsylvania in New York City, still holds
PEnnsylvania 6-5000 Hotel Pennsylvania, claims it to be the oldest continuing telephone number in New York City. While the hotel opened in 1919, the exact age of the telephone number and the veracity of the hotel's claim are unknown. At the time of Glenn Miller's popular network radio broadcasts, most local telephone calls in large cities were being dialed directly. All intercity calls required the operator. There were no area codes. The length of local numbers varied widely; four or five digits was more than enough for a small city with a single central office, while separate central offices served individual neighborhoods