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2. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888.Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future.

3. Number sign - Wikipedia

   en.wikipedia.org/wiki/Number_sign

   The symbol # is known variously in English-speaking regions as the number sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔.

4. Telephone numbers in Colombia - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_colombia

   When the current format was adopted in that year, existing toll-free numbers were given the format 01-800-0XX-XXXX. These numbers were advertised with the grouping 01-8000-XX-XXX, leading many people to erroneously believe that the general prefix for toll-free numbers is 01-8000.

5. Whitepages (company) - Wikipedia

   en.wikipedia.org/wiki/Whitepages_(company)

   Algard was searching for a friend's contact information, and the phone company gave him the wrong number. [4] He thought of an online email directory as an easier way to find people. [5] [6] Algard bought the Whitepages.com domain for $900, [7] [8] which he says was all of his savings at the time. [5]

6. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   This is a list of articles about prime numbers. A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.

7. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   400-toll-free numbers with prefix "4001" are international toll-free numbers which can be routed to destination numbers inside or outside China. 400 toll-free numbers with prefix "4000", "4006", "4007" or "4008" are national toll-free numbers which can be routed to China destination numbers only.