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Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
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The first 878 numbers were assigned in April 2013, nearly 12 years after the overlay was activated. [3] On September 15, 2015, the first prefix (999) was assigned in the 412 territory. [4] As of February 2020, Verizon is issuing 878 telephone numbers for 412's original territory.
The Bell Telephone Company of Pennsylvania Western Headquarters Building (also known as the Verizon Building) is a structure at 201 Stanwix Street in downtown Pittsburgh, Pennsylvania. The 12-story building, which was built between 1956 and 1957.
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All-number calling (ANC) is a telephone numbering plan that was introduced into the North American Numbering Plan by the Bell System in the United States starting in 1958 [1] to replace the previous system of using a telephone exchange name as the first part of a telephone number. [2]
Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). If there is only 32.. followed by any other, shorter number, like 32 51 724859, this is the number of a normal phone, not a mobile. 46x: Join (discontinued mobile phone service provider) [3] 47x: Proximus (or other) 48x