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For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line number. If the numbering plan area does not use an overlay plan with multiple area codes, or if the provider allows it for other technical reasons, seven-digit dialing may be permissible for calls ...
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).
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.
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.
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 regions only had 5 digit (xxxxx) local numbers until they were upgraded and the numbers were changed to 6 digits. This resulted in the numbers becoming (064) 5xxxxx for Cooma/Snowy Mountains region and (064) 9xxxxx for Bega/Far South Coast region. When phone numbers were changed to 8 digits these two regions became (02) 64xxxxxx numbers.
Until 1985, subscribers' telephone numbers in Singapore were five and six digits. Five digits were introduced in 1960s, whereas 5-digit and 6-digit phone numbers were introduced in 1960s as fixed lines grew, but in that year, these changed to seven digits as the introduction of new towns arose (Tampines, Jurong East, Bukit Batok, Yishun and Hougang) and a large number of new numbers were required.
Local numbers usually consisted of 5-7 digits, with seven-digit numbers only occurring in Moscow (since 1968), Leningrad (since 1976) and Kiev (since 1981). If the internal number of the regional center had less than 7 digits, then its intercity code was supplemented with numbers (usually 2 for the administrative center, 6 for the second ...