7 digit phone number history - Search
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  1. Copilot Answer
    History

    Originally, telephone exchanges consisted of manual switchboards operated by switchboard operators. Telephone numbers had typically two to four digits, depending on the size of the community. As the number of … See more

    Structure

    Within the multinational calling area administered by the North American Numbering Plan, telephone numbers are composed of three fixed-length fields: a three-digit numbering plan area (NPA) code (… See more

    Office code protection

    Traditionally, identical central office codes in adjacent Numbering Plan Areas (NPAs) would be assigned as far apart from each other as possible, so that callers living near an NPA boundary would not confuse numbers i… See more

    Limitations

    Area code overlay complexes introduced the requirement that calls must include the area code, resulting in a ten-digit dialing. Seven-digit dialing remains possible in some areas of North America with a single area code.
    Traditionall… See more

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