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2. 411 (telephone number) - Wikipedia

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

   Direct-distance dialing (DDD) was first introduced in areas with common-control switching (panel and crossbar) in the 1950s.These areas had used 411 for directory assistance, and because of the ability of common-control switching to analyze the initial digits of a number in a "sender" before routing the call, these areas did not require the dialing of an initial 1 to initiate a long-distance call.

3. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   Toll-free numbers are limited to the telephone network where the toll-free number is being handled. So, subscribers of a different telephone network company will not be able to call a toll-free number handled by a different telephone network. International toll-free numbers can only be accessed if the calling party is a PLDT subscriber.

4. Telephone - Wikipedia

   en.wikipedia.org/wiki/Telephone

   An old rotary dial telephone AT&T push button telephone made by Western Electric, model 2500 DMG black, 1980. A telephone, colloquially referred to as a phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly.

5. Telephone numbers in Saudi Arabia - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Saudi...

   This is a discussion of telephone numbers in the Kingdom of Saudi Arabia. The country's calling code is +966. In addition to a numbering plan, there are also dedicated numbers or number formats for Internet services, toll-free numbers, and public or emergency services.

6. Yellow pages - Wikipedia

   en.wikipedia.org/wiki/Yellow_pages

   The yellow pages are telephone directories of businesses, organized by category rather than alphabetically by business name, in which advertising is sold. The directories were originally printed on yellow paper, as opposed to white pages for non-commercial listings.

7. Telephone numbers in Mexico - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Mexico

   Telephone numbers in Mexico are regulated by the Federal Telecommunications Institute, an independent government agency of Mexico. The agency published the Fundamental Technical Plan for Numbering ( Plan Técnico Fundamental de Numeración ) on May 11, 2013. [ 1 ]