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Mobile country code Country ISO 3166 Mobile network codes National MNC authority Remarks 289 A Abkhazia GE-AB List of mobile network codes in Abkhazia MCC is not listed by ITU 412 Afghanistan AF List of mobile network codes in Afghanistan 276 Albania AL List of mobile network codes in Albania 603 Algeria DZ List of mobile network codes in Algeria 544 American Samoa (United States of America ...
Bell cites several earlier publications on these numbers, beginning with Dobiński 1877 which gives Dobiński's formula for the Bell numbers. Bell called these numbers "exponential numbers"; the name "Bell numbers" and the notation B n for these numbers was given to them by Becker & Riordan 1948. [29]
The system was based on fixed-length numbers; a direct-dial long-distance call consisted of a three-digit area code and a seven-digit local number. Numbers in 2L-4N cities (such as Montréal and Toronto ) were systematically lengthened to seven digits in the 1950s, a few exchanges at a time, so that all local numbers were seven digits when ...
Bell Mobility: Bell Mobility: Operational: UMTS 850 / UMTS 1900 / LTE 700 / LTE 1700 / LTE 1900 / LTE 2600 / 5G 1700 / 5G 3500: Used in IMSI to identify Bell subscribers on shared network 302–880; LTE bands 17, 29, 4, 2, 7 302: 620: ICE Wireless: ICE Wireless: Operational: UMTS 850 / GSM 1900 / LTE 850 / LTE 1900: Northern Canada 302: 630 ...
The most prominent facility for telephone number mapping is the E.164 number to URI mapping (ENUM) standard. It uses special DNS record types to translate a telephone number into a Uniform Resource Identifier (URI) or IP address that can be used in Internet communications.
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In feature group 'D', the current system, subscribers may dial the prefix "10" and a three-digit code identifying a long-distance carrier to handle the InterLATA call. For example, 10-288 sent a call via AT&T, 10-333 via Sprint, and 10-550 via CenturyLink. Starting in July 1998, [13] "10" needed to be used before the five-digit carrier ...
In mathematics, the Bell triangle is a triangle of numbers analogous to Pascal's triangle, whose values count partitions of a set in which a given element is the largest singleton. It is named for its close connection to the Bell numbers, [1] which may be found on both sides of the triangle, and which are in turn named after Eric Temple Bell.