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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]
Area code 603 in a 1956 map, covering the whole state.. Area code 603 is the sole area code for the U.S. state of New Hampshire in the North American Numbering Plan (NANP). It was created as one of the original 86 numbering plan areas in October 1947.
Following the sale, Northern New England Telephone Operations was converted to a limited liability company (LLC). The company's operations in Vermont were separated into Telephone Operating Company of Vermont , which is wholly owned by NNETO.
For example, 234 235-5678 is a valid telephone number; with area code 234, central office prefix (exchange) 235, and line number 5678. The number 234 911-5678 is invalid, because the central office code must not be in the form N11. 314 159-2653 is invalid, because the office code must not begin with 1.
In 2001, it was planned to overlay area code 614 with area code 380, in anticipation of exhaustion. However, the anticipated growth did not materialize and number pooling replaced the proposal. On January 14, 2015 the PUCO instructed the telecommunications industry to finally implement the new area code on February 27, 2016. [3]
When a subscriber dialed the number of a manual station, an operator at the destination office answered the call after seeing the number on an indicator, and connected the call by plugging a cord into the outgoing circuit and ringing the destination station. For example, if a dial customer calling from TAylor 4725 dialed a number served by a ...
Numbering plan areas and area codes since May 2001 September 1997 [1] – May 2001 [2] July 1988 [3] – September 1997 [4] [5] October 1947 – July 1988 [6]. Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [7] organized as four overlay complexes and a single-area code NPA.
The following is a list of New Hampshire state agencies—government agencies of the U.S. state of New Hampshire.Entries are listed alphabetically per their first distinguishing word (e.g. the New Hampshire Department of Agriculture, Markets, and Food is listed under "A" for Agriculture), with subordinate agencies listed under their parent agency.