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Additionally there are special numbers with the following conventions: 3 digit numbers for emergency systems, four digit numbers, 15NN for information and governmental institutions and 17NN for commercial and banking institutions with a high call influx, 6 digit numbers for Telephone carriers numbers and making operator assisted calls, collect ...
These letter assignments have been used for multiple purposes. Originally, they referred to the leading letters of telephone exchange names. In the mid-20th century United States, before the switch to All-Number Calling, telephone numbers had seven digits, including a two-digit prefix which was expressed in letters rather than digits, e.g.; KL5 ...
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number. [5] xx 7: xx 8: xx 9: British Indian Ocean Territory +246: 380 7 387 British Virgin Islands +1: 284: 10
The serial or the numbered occurrence of a link between two PTOs between 2 cities was usually the next free number in the system, but the CCITT allowed for the re-use of old serial numbers after a period of 6 months. A customer ordering 3 links could be allocated DP23, DP24 and then DP6 between 2 major cities.
In Greece, the toll-free prefix is "800" followed by a seven-digit number or "807" followed by a four-digit number, used for phone card services only. In Hong Kong, toll-free numbers have the "800" prefix. [18] In Hungary, toll-free numbers have the "80" prefix. In Iceland, the toll-free prefix is "800", followed by a four-digit number.
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
Telephone numbers are fixed at eight digits for area code 02, and seven digits for area codes from 03X to 09X, with area codes fixed at one, two, or three digits (a six-digit system was used until the mid-1990s; four to five digits were used in the countryside). Mobile phone numbers are always 10 digits (three digits for the service provider ...
The total length of all phone numbers (area code and the phone number) is constant at 10 digits. For example, the number 7513200000 signifies the area code 751 (the area code for Gwalior) followed by the phone number. Fixed-line or landline numbers are at most 8 digits long.