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  2. Mobile phone jammer - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_jammer

    Example of a mobile phone jammer, produced by Jammerspro. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting ...

  3. Stealth wallpaper - Wikipedia

    en.wikipedia.org/wiki/Stealth_wallpaper

    For computer network security, stealth wallpaper is a material designed to prevent an indoor Wi-Fi network from extending or "leaking" to the outside of a building, where malicious persons may attempt to eavesdrop or attack a network.

  4. Call blocking - Wikipedia

    en.wikipedia.org/wiki/Call_blocking

    Call blocking, also known as call block, call screening, or call rejection, allows a telephone subscriber to block incoming calls from specific telephone numbers. This feature may require an additional payment to the subscriber's telephone company or a third-party. Call blocking is desired by individuals who wish to block unwanted phone calls.

  5. Outlawed anti-drone radio jammers are being marketed on ... - AOL

    www.aol.com/news/anti-drone-companies-market...

    In general, even local police aren’t legally allowed to use them. “These jamming devices pose significant risks to public safety and potentially compromise other radio communications services ...

  6. Radio jamming - Wikipedia

    en.wikipedia.org/wiki/Radio_jamming

    Radio jamming is the deliberate blocking of or interference with wireless communications. [1] [2] In some cases, jammers work by the transmission of radio signals that disrupt telecommunications by decreasing the signal-to-noise ratio.

  7. Cellphone surveillance - Wikipedia

    en.wikipedia.org/wiki/Cellphone_surveillance

    U.S. law enforcement agencies can also legally track the movements of people from their mobile phone signals upon obtaining a court order to do so. [ 2 ] These invasive legal surveillance can cause a change in public behaviors directing our ways of communication away from technology based devices.

  8. Desensitization (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Desensitization...

    When an interfering signal is present, it can contribute to the level of the spurious signals. Stronger interference generates stronger spurious signals. The interference may be at a different frequency than the signal of interest, but the spurious signals caused by that interference can show up at the same frequency as the signal of interest.

  9. Piggybacking (Internet access) - Wikipedia

    en.wikipedia.org/wiki/Piggybacking_(Internet_access)

    Also known as tethering, one can interface to their phone either wirelessly using Bluetooth or Wi-Fi or wired via cable allowing access to the Internet anywhere there is a cell network signal. Many jurisdictions have been experimenting with statewide, province-wide, county-wide or municipal wireless network access.