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  2. 555 (telephone number) - Wikipedia

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

    The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-XXXX, in each numbering plan area (NPA) (area code). It has traditionally been used only for the provision of directory assistance, when dialing NPA-555-1212.

  3. Lookup table - Wikipedia

    en.wikipedia.org/wiki/Lookup_table

    Lookup table. In computer science, a lookup table ( LUT) is an array that replaces runtime computation with a simpler array indexing operation, in a process termed as direct addressing. The savings in processing time can be significant, because retrieving a value from memory is often faster than carrying out an "expensive" computation or input ...

  4. Reverse 911 - Wikipedia

    en.wikipedia.org/wiki/Reverse_911

    Reverse 911. Reverse 911 is a public safety communications technology used by public safety organizations in Canada and the United States to communicate with groups of people in a defined geographic area. The system uses a database of telephone numbers and associated addresses, which, when tied into geographic information systems (GIS), can be ...

  5. RealCall - Wikipedia

    en.wikipedia.org/wiki/Realcall

    RealCall. RealCall is a US-based AI caller identification and call blocking smartphone application, used to detect, engage and block call and SMS scamming and spamming. It has AI algorithms with built-in free reverse phone lookup service and customized answer bots for detection, engagement and blocking of unwanted calls and messages. [1]

  6. 411 (telephone number) - Wikipedia

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

    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".

  7. Talk:Reverse telephone directory - Wikipedia

    en.wikipedia.org/wiki/Talk:Reverse_telephone...

    In the United Kingdom, Ireland and many other countries it is illegal to perform a reverse lookup from a phone number, although some companies have attempted to sell reverse directories. CD-ROM telephone directories supplied by telephone operators are now sold in an encrypted format that allows only lookups from a name and address.

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