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A telephone number is a sequence of digits assigned ... exterior sign showing the shop's telephone number in the old two ... the thousand digit of 5 (e.g. 55 5XXX ...
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).
Kenmore 9392 is a five-pull (1L-4N) small-city telephone number for the Kenmore exchange in Fort Wayne, Indiana. MArket 7032 is a six-digit (2L-4N) telephone number. This format was in use from the 1920s through the 1950s, and was phased out c. 1960. BALdwin 6828 is an urban 3L-4N example, used only in the largest cities before conversion to ...
Number ranges starting 01 can have National Significant Number (NSN) length of 10 or (very rarely) 9 digits. NSN is the number of digits after the leading 0 trunk code or +44 international prefix. The 0800 range can have NSN length as 10, 9, or 7 digits. The 0845 range can have NSN length as 10 or 7 digits.
Telephone dial number card of c.1948 with the local telephone number 4-5876 in Atlantic City, NJ, using the central office prefix 4, later converted to AT4. Face of a 1939 rotary telephone dial with the telephone number LA-2697, which includes the first two letters of Lakewood, New Jersey, as the central office prefix, later converted to LA6.
A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced ...
Local phone numbers have either 5, 6 or 7-digits. In 7-digit numbering they are usually grouped as BBB BBBB, 6-digit numbers are grouped BBB BBB and 5-digit numbers are normally all grouped together BBBBB Grouping of numbers is not strictly adhered to, but usually fairly consistent.
There was a parallel run of 7-digit and 8-digit numbers from 1 March 2002 to 31 March 2002. From 1 April 2002 to 30 June 2002, those calling the 7-digit numbers would hear the number change announced, prompting them to add the digit "6" to the old number, after which the call would be disconnected.