What are cellphone jammers?

[cmo]

What are cellphone jammers?

http://www.mb.com.ph/sites/default/files/jam_0.jpg
A variety of cellphone signal jamming devices. (Photo from www.phone-jammer.com (http://www.phone-jammer.com) )

In preparation for the coming National Elections this May, the Commission on Elections (Comelec) is not the only body busy working these days. Recent unconfirmed reports have surfaced that a worrisome amount of cellphone jamming devices were shipped in the country.

Although these signal jamming devices are not so unusual, the reported large amount ignites speculations that they may be used to sabotage the dissemination of results in the upcoming election process. Comelec Spokesperson James Jimenez had said that the Comelec is prepared with setbacks, such as the loss of cellphone signals and has formulated countermeasures for them on Election Day.

It is an obvious thing that cellphone signal jamming devices, well, jam cellphone signals. But how does it really work?

A cellphone is a two-way radio used for communication. But it is more complex because it can transmit and receive radio frequencies simultaneously, unlike walkie-talkies, making it possible for both parties to talk and listen at the same time. It works by transmitting frequencies to a service network or a cell tower. Through the cell towers, the frequency is delivered through different locations, making it possible to communicate with people across the country or even the globe.

A cellphone signal jamming device transmits signals at a similar frequency as the cellphone, thus, blocking the frequencies from reaching the nearest cell tower and disrupting the transmissions.

Some countries, such as India and France, use cellphone signal jamming devices in theaters and religious places to avoid interrupting performances and religious activities.

source (http://www.mb.com.ph/articles/241650/what-are-cellphone-jammers)

[maxdakota]

Jammers are also used on the vehicles like a car where they are mounted on the top bonnet of the car used for the protection of any person celebrity or political leaders or any other well known person. The jammers are also used on the two wheelers riding in front and behind of the car of these people.

[Eveadam]

cell phone jammers (http://www.jammerall.com/) can be used in many ways, like in the church, court,jail and during the exam in school. sometimes it can be really helpful and lovely! LOL~~~:yey:

[alexknows]

cell phone jammers (http://www.jammer-store.com) can be used in many ways, like in the church, court,jail and during the exam in school. sometimes it can be really helpful and lovely! LOL~~~:yey:

but please note that those devices are illegal in US and most EU countries

[DarrelMartin]

Jammers are used on the automobiles like a car where they are attached on the top hood of the car used for the security of any individual superstar or governmental management or any other well known individual. The jammers are also used on the two wheelers driving before side and behind of the car of these individuals.

[Fedricwalls]

but please note that those devices are illegal in US and most EU countries

I'm totally agreed with you that this type of cellphone jammers are prohibited in some countries for the common peoples. This service is only for protection from terrorists and any kind of celebrities and politician for the purpose of their safety.

[jaychristian]

As excellently explained, Cell Phone jammers trasmit the signals to control tower at the frequencies which are equal to that of the frequency of signals transmitted or received by Cell Phones.This blocks the incoming or outgoing signals causing disruption in communication.