As discussed in the first part (“History of the Telephone Number: Early Years”) of this series, telephone numbers through the first half of the twentieth century used the 2L-5N system (two letters and five numbers). The two letters of the telephone numbers corresponded to a memorable word, such as BUtterfield or ANdrew. As demand grew following World War II, however, limitations in this system quickly became apparent. The numeral 1 was reserved for long-distance dialing, and 0 was reserved for the operator. Several combinations, such as 57 and 97, were unusable because it was impossible to make a corresponding word.
The Bell System split some area codes to allow reuse of numbers, which worked for a time – only two new area codes were added between 1962 and 1981. Nonetheless, in 1958, AT
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