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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. 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. 811 is excluded because it is a special dialing ...

3. Ceefax - Wikipedia

   en.wikipedia.org/wiki/Ceefax

   Early test data being received in 1972 – a pangram and numbers The idea was later taken up again, this time in digital and on-screen form, under the new name of CEEFAX, meaning "see facts". [ 5 ] The new system was announced in October 1972, and following test transmissions in 1972–74, the Ceefax system went live on 23 September 1974 with ...

4. Automatic number identification - Wikipedia

   en.wikipedia.org/wiki/Automatic_number...

   Modern toll-free telephone numbers, which generate itemized billing of all calls received instead of relying on the special fixed-rate trunks of the Bell System's original Inward WATS service, depend on ANI to track inbound calls to numbers in special area codes such as +1-800, 888, 877, 866, 855, 844, and 833 with 822 reserved for future toll free use (United States and Canada), 1800 ...

5. Telephone number verification - Wikipedia

   en.wikipedia.org/wiki/Telephone_number_verification

   Telephone number verification. Telephone number verification (or validation) services are online services used to establish whether a given telephone number is in service. They may include a form of Turing test to further determine if a human answers or answering equipment such as a modem, fax, voice mMail or answering machine.

6. 555 (telephone number) - Wikipedia

   en.wikipedia.org/wiki/555_(telephone_number)

   The 555 exchange is not reserved in area codes used for toll-free phone numbers. This led to the video game The Last of Us accidentally including the number to a phone-sex operator. [9] The number "555-2368" (or 311-555-2368) is a carryover from the "EXchange 2368" ("Exchange CENTral") number common in telephone advertisements as early as the ...

7. Fax - Wikipedia

   en.wikipedia.org/wiki/Fax

   The roll was inserted into a compartment in the machine. Fax (short for facsimile), sometimes called telecopying or telefax (short for telefacsimile), is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other output device.