Why do local telephone numbers never start with the number one?

The original dial telephone sent out a signal “click” for each number dialled. One click for 1, two “clicks” for 2, etcetera. The zero was reserved for the operator. “One” was never used because early switching systems read every signal as beginning with one click, regardless of the number you were dialling, and so technically, no phone number could start with 1. It continues today simply as tradition.

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