A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from or transmitting signals to base stations. When used, the jammer effectively disables cellular phones. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected.
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History
The rapid proliferation of cell phones at the beginning of the 21st century to near ubiquitous status eventually raised problems such as their potential use to invade privacy, contribute to academic cheating, or even aid in industrial espionage. In addition public backlash was growing against the intrusive disruption cell phones introduced in daily life. While older analog cell phones often suffered from chronically poor reception and could even be disconnected by simple interference such as high frequency noise, increasingly sophisticated digital phones have led to more elaborate counters. Cell phone jamming devices are an alternative to more expensive measures against cell phones, such as Faraday cages, which are mostly suitable as built in protection for structures. They were originally developed for law enforcement and the military to interrupt communications by criminals and terrorists. Some were also designed to foil the use of certain remotely detonated explosives. The civilian applications were apparent, so over time many companies originally contracted to design jammers for government use switched over to sell these devices to private entities. Since then, there has been a slow but steady increase in their purchase and use, especially in major metropolitan areas.
Operation
As with other radio jamming, cell phone jammers block cell phone use by sending out radio waves along the same frequencies that cellular phones use. This causes enough interference with the communication between cell phones and towers to render the phones unusable. On most retail phones, the network would simply appear out of range. Most cell phones use different bands to send and receive communications from towers (called full duplexing). Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies. Smaller handheld models block all bands from 800MHz to 1900MHz within a 30 foot range (9 meters). Small devices tend to use the former method, while larger more expensive models may interfere directly with the tower. The radius of cell phone jammers can range from a dozen feet for pocket models to kilometers for more dedicated units. The TRJ-89 jammer can block cellular communications for a 5-mile (8 km) radius. [1]
Older jammers sometimes were limited to working on phones using only analog or older digital mobile phone standards. Newer models such as the double and triple band jammers can block all widely used systems (AMPS, iDEN, GSM, et al) and are even very effective against newer phones which hop to different frequencies and systems when interfered with. As the dominant network technology and frequencies used for mobile phones vary worldwide, some work only in specific regions such as Europe or North America.
The jammer's effect can vary widely based on factors such as proximity to towers, indoor and outdoor settings, presence of buildings and landscape, even temperature and humidity play a role.
There are concerns that crudely designed jammers may disrupt the functioning of medical devices such as pacemakers. However, like cell phones, most of the devices in common use operate at low enough power output (<1W) to avoid causing any problems.
Legalities
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Since these jammers actively broadcast radio signals they may or may not be legal to possess or operate based on the specific laws of the area one is in.
- Armenia : legal[citation needed]
- Australia: illegal.
- Belgium: illegal to sell, possess and operate (licensed part of the spectrum).
- Canada: illegal, except by federal law-enforcement agencies who have obtained approval[2]
- People's Republic of China: Used by the Education government department as a method of thwarting cheating in schools. During major end of year exams, mobile phone jammers are used in areas surrounding high schools to prevent students inside from receiving calls or text messages, which may be used for illicit purposes. In some municipalities however, rather than the use of jammers, mobile signal towers close to schools are temporarily shut down for the duration of the week as exams are in progress.
- Czech Republic: illegal.
- Finland: illegal.
- France: France legalized cell-phone jammers in (movie) theaters and other places with performances in 2004. Abandoned due to complaints regarding emergency calls. Still legally used inside jails.
- Germany: illegal, but installation in jails has been proposed.
- India: government and schools use jammers.
- Italy: technically not illegal to own, but illegal to operate, since the Italian law specifically prohibits to disturb radio and telephone communications. GSM jammers are however legal to be used in places like hospitals, churches, movie theatres and other places with performances, and other buildings where and when the use of mobile telephones may result in a leak of sensitive information: on such occasions, jammers are legal as long as their operation doesn't interfere with electronic medical equipment (such as pace-makers) and allows mobile phones to make emergency calls. Tri-Band Jammers are reserved to, and in use with, the police forces and are being experimented in prisons.
- Japan: Illegal to use, but legal to own. So, people can buy small mobile types. Fixed type is not popular, cause heavy fine (max 250,000USD)/ long in prison (max 5yr.) in law and easy to detect it.
- Mexico: legal inside jails, often used also in churches and hospitals.
- Turkey: illegal. Only the police and the military use jammers.
- New Zealand: legal inside jails.[3]
- Norway: illegal to own and operate. The police and the military can use jammers in situations in which it is necessary.
- Pakistan: legal inside banks, often used also in libraries.
- United Kingdom: illegal to use, but legal to own.
- United States: illegal to operate, manufacture, import, or offer for sale, including advertising (Communications Act of 1934)[4], with fines of up to $11,000 and imprisonment of up to one year. [5]
Notes and references
- ^ Howstuffworks "How Cell-phone Jammers Work"
- ^ Radiocommunication Act of Canada
- ^ Cellphone jamming technology will be placed in all NZ prisons | NATIONAL | NEWS | tvnz.co.nz
- ^ Communications Act of 1934: as ammended by Telecom Act of 1996
- ^ FCC: Wireless Services: Cellular Services: Operations: Blocking & Jamming
External links
- Devices Enforce Cellular Silence, Sweet but Illegal Nov 4, 2007 NY Times
- Silent but Deadly, the Jammer’s Revenge on Mobile Prattlers Nov 18, 2007 The Sunday Times
Beyoncé - Single Ladies (w/lyrics)
The 1st single, (Together with "If I Were A Boy"), "Single Ladies (Put a Ring On It)", by Beyoncé Knowles. From Beyoncé's album "I Am... Sasha Fierce". Slideshow with pics of Beyoncé. /2008 Lyrics: All the single ladies (7x) Now put your hands up Up in the club, we just broke up Im doing my own little thing Decided to dip but now you wanna trip Cuz another brother noticed me Im up on him, he up on me dont pay him any attention cried my tears, for three good years Ya cant be mad at me Cuz if you liked it then you should have put a ring on it If you liked it then you shoulda put a ring on it Dont be mad once you see that want it If you liked it then you shoulda put a ring on it I got gloss on my lips, a man on my hips Got me tighter than my Dereon jeans acting up, drink in my cup I could care less what you think I need no permission, did I mention Dont pay him any attention Cuz you had your turn But now you gonna learn What it really feels like to miss me Dont treat me to the things of this world Im not that kind of girl Your love is what I prefer, what I deserve Hes a man that makes me then takes me And delivers me to a destiny, to infinity and beyond Pull me into your arms Say Im the one you own If you dont, youll be alone And like a ghost Ill be gone All the single ladies (7x) Now put your hands up All my single ladies throw your hands in the air All my single ladies throw your hands in the air Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Here we go again, check on your man Fast as we can, we got an evil plan If you can't follow me, get out the game Call for backup as soon as you hear my name! It's time to get nasty Look at me, I'm fabulously sexy Front of the line, VIP We're celebrity You got me feeling nasty baby It's kinda hot but it's so damn crazy It feels so good to be a single lady, baby Don't be afraid to explore my body Take off your clothes, get naughty Let's funk away this party Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Don't know where I left my cell phone I mean, this song really turns me on We could be jamming all night long The vibe is coming over me so strong I'm feeling we've just begun Let me help you put it on
Author: TistrupMisser
Keywords: Beyonce Single Ladies Put Ring On It
Added: January 3, 2009
WTI's Mobile Blocker / cell phone jammer demonstration Video - as seen on FOX 11 news
021202: Fox 11 Los Angeles news report on WTI's (Wireless Technology, Inc.) cell phone jammer, the MobileBlocker. For more technical information on MobileBlocker systems and how they work please visit us on the web at www.gotowti.com.
Author: gotoWTI
Keywords: Mobile blocker cell phone jammer jamming technology telephone security safety wireless mobileblocker CCTV cellular
Added: December 31, 2008
Beyonce - Single Ladies (Put A Ring On It) - Official Music Video with Lyrics
Beyonce - Single Ladies (Official Music Video) with Lyrics LYRICS: All the single ladies (7x) Now put your hands up Up in the club, we just broke up Im doing my own little thing Decided to dip but now you wanna trip Cuz another brother noticed me Im up on him, he up on me dont pay him any attention cried my tears, for three good years Ya cant be mad at me [Chorus] Cuz if you liked it then you should have put a ring on it If you liked it then you shoulda put a ring on it Dont be mad once you see that want it If you liked it then you shoulda put a ring on it (Chorus) I got gloss on my lips, a man on my hips Got me tighter than my Dereon jeans acting up, drink in my cup I could care less what you think I need no permission, did I mention Dont pay him any attention Cuz you had your turn But now you gonna learn What it really feels like to miss me (Chorus) Dont treat me to the things of this world Im not that kind of girl Your love is what I prefer, what I deserve Hes a man that makes me then takes me And delivers me to a destiny, to infinity and beyond Pull me into your arms Say Im the one you own If you dont, youll be alone And like a ghost Ill be gone All the single ladies (7x) Now put your hands up (Chorus) All my single ladies throw your hands in the air All my single ladies throw your hands in the air Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Here we go again, check on your man Fast as we can, we got an evil plan If you can't follow me, get out the game Call for backup as soon as you hear my name! Hook: It's time to get nasty Look at me, I'm fabulously sexy Front of the line, VIP We're celebrity Chorus: You got me feeling nasty baby It's kinda hot but it's so damn crazy It feels so good to be a single lady, baby Don't be afraid to explore my body Take off your clothes, get naughty Let's funk away this party Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Don't know where I left my cell phone I mean, this song really turns me on We could be jamming all night long The vibe is coming over me so strong I'm feeling we've just begun Let me help you put it on Repeat Chorus T-Pain: TP and B-E-E Sure u aint ready to party with the wife of Jay Z She pretend to be a single lady So she can ride with me I came in to check on her But I keep looking at shorty she so hot that I wish she was my beyonce (Cant understand this part lol) Nappy boy in love with baby bee All my single ladies throw your hands All my single ladies throw your hands All my single ladies theow your hands up In the air! Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that
Author: musicvideos10001
Keywords: Beyonce Single Ladies (Put Ring On It) Pop Music Video lyrics
Added: December 30, 2008
LIRR yakker jammed at the speed of light
This yakker obviously has AT&T, which service gets eaten up by jammers. It's like a light switch, cut off in mid sentence, without having to wait for the jammer to gradually overtake the cell phone. Hope he got his order in to the Chinese restaurant....
Author: ibilkut
Keywords: LIRR yakker yaking jammed jammer
Added: December 23, 2008
Beyonce - Single Ladies (Put A Ring On It) OFFICIAL VIDEO NEW
All the single ladies (7x) Now put your hands up Up in the club, we just broke up I'm doing my own little thing Decided to dip but now you wanna trip Cuz another brother noticed me I'm up on him, he up on me dont pay him any attention cried my tears, for three good years Ya can't be mad at me [Chorus] Cuz if you liked it then you should have put a ring on it If you liked it then you shoulda put a ring on it Don't be mad once you see that want it If you liked it then you shoulda put a ring on it (Chorus) I got gloss on my lips, a man on my hips Got me tighter than my Dereon jeans acting up, drink in my cup I could care less what you think I need no permission, did I mention Dont pay him any attention Cuz you had your turn But now you gonna learn What it really feels like to miss me (Chorus) Don't treat me to the things of this world I'm not that kind of girl Your love is what I prefer, what I deserve He's a man that makes me then takes me And delivers me to a destiny, to infinity and beyond Pull me into your arms Say I'm the one you own If you don't, you'll be alone And like a ghost I'll be gone All the single ladies (7x) Now put your hands up (Chorus) All my single ladies throw your hands in the air All my single ladies throw your hands in the air Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Here we go again, check on your man Fast as we can, we got an evil plan If you can't follow me, get out the game Call for backup as soon as you hear my name! Hook: It's time to get nasty Look at me, I'm fabulously sexy [ Beyonce Lyrics are found on www.songlyrics.com ] Front of the line, VIP We're celebrity Chorus: You got me feeling nasty baby It's kinda hot but it's so damn crazy It feels so good to be a single lady, baby Don't be afraid to explore my body Take off your clothes, get naughty Let's funk away this party Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Don't know where I left my cell phone I mean, this song really turns me on We could be jamming all night long The vibe is coming over me so strong I'm feeling we've just begun Let me help you put it on Repeat Chorus T-Pain: TP and B-E-E Sure u aint ready to party with the wife of Jay Z She pretend to be a single lady So she can ride with me I came in to check on her But I keep looking at shorty she so hot that I wish she was my beyonce (Cant understand this part lol) Nappy boy in love with baby bee All my single ladies throw your hands All my single ladies throw your hands All my single ladies theow your hands up In the air! Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that Do it, do it, do it Do it, do it, do it Do it, do it, do it like that
Author: souljagirllookin4sou
Keywords: beyonce single ladies
Added: December 21, 2008