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2. Telephone numbers in Canada - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Canada

   Learn about the format, prefixes, and area codes of Canadian telephone numbers, as well as the history and regulation of the North American Numbering Plan. The country code for Canada is 1, which is used for international access and trunk prefix.

3. Reverse telephone directory - Wikipedia

   en.wikipedia.org/wiki/Reverse_telephone_directory

   Learn about reverse telephone directories, which allow users to search by a telephone number to retrieve customer details. Find out the history, legal cases, and availability of reverse directories in different countries, including Australia.

4. Telephone exchange names - Wikipedia

   en.wikipedia.org/wiki/Telephone_exchange_names

   Learn about the history and usage of telephone exchange names or central office names, which were assigned to switching systems in different localities. Find out how they were dialed, displayed, and replaced by numeric systems in various countries.

5. Seven-digit dialing - Wikipedia

   en.wikipedia.org/wiki/Seven-digit_dialing

   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 ...

6. 411 (telephone number) - Wikipedia

   en.wikipedia.org/wiki/411_(telephone_number)

   411 is a telephone number for local directory assistance in Canada and the United States. Until the early 1980s, 411 – and the related 113 number – were free to call in most jurisdictions. In the United States, the service is commonly known as "information", [1] although its official name is "directory assistance". [2]

7. Telephone directory - Wikipedia

   en.wikipedia.org/wiki/Telephone_directory

   Learn about the history, types, and publication of telephone directories, also known as phone books, white and yellow pages, or the white and yellow pages. Find out how they list subscribers by name, address, and number, and how they evolved from paper to online formats.