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2. Call blocking - Wikipedia

   en.wikipedia.org/wiki/Call_blocking

   [1] [2] Such devices and services enable the user to block a call as it is in progress or alternatively block the number after the call is made. These devices rely on caller ID information and thus a phone blocker requires a caller ID service active on the line for blocking to function. Treatment of blocked calls may include: Sending the caller ...

3. 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 ...

4. Robocall - Wikipedia

   en.wikipedia.org/wiki/Robocall

   In its simplest form, this method offers the ability to prevent further calls from phone numbers, once they are known to be a source of robocalls. Many mobile apps can prevent robocalls with a user generated blacklist. Landline call blocker in use. For landlines there are standalone call blockers which connect to the telephone.

5. 7 of the best robocall blocking apps and tools for avoiding ...

   www.aol.com/news/7-best-robocall-blocking-apps...

   If there's one thing people with iPhones and Android phones can agree on, it's this: Robocalls suck. Personally speaking, robots call me more than my own mother does. A very concerned "Cynthia ...

6. Automatic number announcement circuit - Wikipedia

   en.wikipedia.org/wiki/Automatic_number...

   They are intended for use by phone company technicians, the ANAC system bypasses customer features, such as unlisted numbers, caller ID blocking, and outgoing call blocking. Installers of multi-line business services where outgoing calls from all lines display the company's main number on call display can use ANAC to identify a specific line in ...

7. 5 must-know tips for getting a text, call through after a big ...

   www.aol.com/news/5-must-know-tips-getting...

   Tips for making a call during an emergency. If you're making a phone call: Keep it short. The Federal Communication Commission recommends limiting “non-essential calls” and keeping the call ...