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  2. 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.

  3. IMSI-catcher - Wikipedia

    en.wikipedia.org/wiki/IMSI-catcher

    All mobile phones in the area covered by the catcher have no access to the network. Incoming and outgoing calls cannot be patched through for these subscribers. Only the observed person has an indirect connection. There are some disclosing factors. In most cases, the operation cannot be recognized immediately by the subscriber.

  4. Receiving unexpected international calls? What you need ... - AOL

    www.aol.com/receiving-unexpected-international...

    4) Use call-blocking apps: Consider installing call-blocking apps to identify and block spam calls. 5) Be cautious with personal information: Never share sensitive data over the phone, especially ...

  5. 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 ...

  6. Tech Social 101’s first tip helps with blocking calls from potential scammers. To use this setting, first, go to Settings, then click on Phone and turn on the feature labeled “Silence Unknown ...

  7. TikToker reveals ‘secret’ hack for blocking spam calls on an ...

    www.aol.com/lifestyle/tiktoker-reveals-secret...

    The TikTok user is drawing plenty of praise online. The post TikToker reveals ‘secret’ hack for blocking spam calls on an iPhone appeared first on In The Know.

  8. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.

  9. Fixed Dialing Number - Wikipedia

    en.wikipedia.org/wiki/Fixed_dialing_number

    Fixed Dialing Number (FDN) is a service mode of a GSM mobile phone's SIM card. [1] Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. [1] A notable exception is that emergency calls to 000, 112, 911, 999 and the like are exempt. [2]