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Q: What years were 4 digit phone numbers use in the us?
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4-digit phone numbers were used in the early days of telephone systems, particularly in the mid-20th century. In the United States, 4-digit phone numbers were common in the 1940s and 1950s before transitioning to 7-digit numbers. The exact year when 4-digit phone numbers were phased out varied by location and telephone company.


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