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As demand for telephones grew, more telephone numbers were required. This would often see an exchange with existing three-digit numbers open one or more new ranges with four-digit local numbers (e.g. 5000-6999), and exchanges with existing four-digit numbers open one or more new ranges with five-digit local numbers (e.g. 60000–69999).
His residence was phone number 1 and his shop was phone number 2 in Boston. ... Although in many areas being a prefix of 55 plus the thousand digit of 5 (e.g. 55 5XXX ...
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]
The telephone played a major communications role in American history from the 1876 publication of its first patent by Alexander Graham Bell onward. In the 20th century the American Telephone and Telegraph Company (AT&T) dominated the telecommunication market as the at times largest company in the world, until it was broken up in 1982 and replaced by a system of competitors.
The first automated dial exchanges in the Bell System were deployed in 1919. [5] When seven-digit telephone numbers were first assigned in New York in 1920, [6] the three-letter four-number (3L-4N) system had represented the number in the format PENnsylvania 5000. Similar systems were used in Boston, Chicago, and Philadelphia.
This rounded the total number of digits in a subscriber telephone number to ten: a three-digit area code, a three-digit central office code, and four digits for each line. This fixed format defined the North American Numbering Plan as a closed numbering plan , [ 27 ] as opposed to developments in other countries where the number of digits was ...
Gaps were left within each of those new 10-digit number ranges to allow for the older 9-digit 02 to 09 numbers to migrate in the Big Number Change. Freephone numbers were an exception. Older 9-digit 0500 and 0800 numbers, as well as newer 10-digit 0800 and 0808 numbers, all remained in use after the Big Number Change.
E.164 permits a maximum length of 15 digits for the complete international phone number consisting of the country code, the national routing code (area code), and the subscriber number. E.164 does not define regional numbering plans, however, it does provide recommendations for new implementations and uniform representation of all telephone ...