science & techWikipedia1951 · United States
Direct-dial coast-to-coast calls began with the first area codes
On 10 November 1951 direct-dial long-distance calls across the United States began. Until then, a coast-to-coast call needed operators to connect each stage. The North American Numbering Plan assigned three-digit area codes and a standard seven-digit number format so that switching equipment could route calls automatically. The first live call was reported between the mayor of Englewood, New Jersey, and the mayor of Alameda, California. The system, designed by AT&T's Bell System, now covers twenty-five regions in twenty countries, under country code 1.
Automating call routing cut costs and operator labour, and its design of area codes is still how North American numbers work.
The plan was designed so that large cities, which would have the most calls, got area codes that were quick to dial.
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