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  2. Unlisted number - Wikipedia

    en.wikipedia.org/wiki/Unlisted_number

    The first type secret number was typically used by celebrities (in this case the address was hidden as well). The second type unlisted number was not listed in the (paper based) phone book, but was listed on the directory service (a voice call to 018 in the 1970s).

  3. Why you need a secret phone number (and how to get one) - AOL

    www.aol.com/why-secret-phone-number-one...

    Your phone number was never meant to be an all-access pass to your life. That 10-digit string has likely followed you around the world and across the internet for years.

  4. Cellphone surveillance - Wikipedia

    en.wikipedia.org/wiki/Cellphone_surveillance

    Intentionally hiding a cell phone in a location is a bugging technique. Some hidden cellphone bugs rely on Wi-Fi hotspots , rather than cellular data, where the tracker rootkit software periodically "wakes up" and signs into a public Wi-Fi hotspot to upload tracker data onto a public internet server.This is also legal

  5. Stingray phone tracker - Wikipedia

    en.wikipedia.org/wiki/Stingray_phone_tracker

    The boosting of power, however, is limited by the design of the devices to a maximum setting. The standard systems are not "high power" and thus can be overpowered by secret systems using much more boosted power that can then take over a user's cell phone. If overpowered that way, a cell phone will not indicate the change due to the secret ...

  6. Secret Service hands agents' phone numbers to Jan. 6 ... - AOL

    www.aol.com/news/secret-hands-agents-phone...

    The U.S. Secret Service has given the House Jan. 6 committee a listing of agency-issued cell phone numbers belonging to agents based in Washington, D.C., for the period the panel is investigating ...

  7. STU-III - Wikipedia

    en.wikipedia.org/wiki/STU-III

    STU-III secure telephones on display at the National Cryptologic Museum in 2005.. Most STU-III units were built for use with what NSA calls Type 1 encryption.This allows them to protect conversations at all security classification levels up to Top Secret, with the maximum level permitted on a call being the lower clearance level of the two persons talking.