Unlisted number
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  (Redirected from Silent number)
In telephony, a silent number, unlisted number (Canada, United States, New Zealand), ex-directory number (United Kingdom) or private number (Australia) is a telephone number that is intentionally not listed in telephone books.
Silent numbers often exist as certain telephone numbers that link to specific tests or control apparatus for the telephone network maintenance staff (such as ringback) and are generally not for public use. Silent numbers are used for residential households as well, primarily for privacy and security concerns.
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