Here you can find your own jammer

Many used car dealers often install long-term GPS tracking systems, the purpose is self-evident. Therefore, signal jammers and signal detectors become popular equipment.
GPS signal jammer are small, high-power radio frequency (RF) transmitters that interfere with legitimate communication devices (cell phones, GPS, Wi-Fi networks, and toll readers).
It emits radio frequency signals at the same frequency as GPS signals, causing interference and preventing GPS devices from receiving accurate signals. This interference can cause GPS devices to lose their connection to GPS satellites, making it impossible to track their position or receive accurate location information. gps jammer are illegal in many countries, including the United States, because they can disrupt the operation of emergency services and other vital systems that rely on GPS signals. Using GPS jammers can also be dangerous and can lead to accidents, especially in industries such as aviation and navigation.
GPS receivers rely on low-power microwave signals broadcast by GPS satellites. GPS signal jammers work by overwhelming these satellite signals with radio signals of higher power but shorter range, creating "noise" that causes the GPS receiver to be unable to accurately calculate its position.
GPS jammers are small, portable and easy to operate. Anyone who wants to disrupt the operation of GPS devices or systems can buy them online and use them.
What does a GPS jammer look like?
Because the devices that can block GPS come from a number of manufacturers, they vary widely in shape, size and dimensions, making them difficult to spot inside a driver's vehicle. Most commonly, GPS interceptors operate over short distances and are small enough to plug into a power source such as a cigarette lighter or iPhone and intercept signals from GPS trackers installed in the cockpit of a vehicle.
Some GPS jammers look like small black boxes or cylindrical devices with antennas, while others are designed to look like everyday items like cell phone chargers or USB drives.
Handheld GPS jammers are usually small and easy to carry. They usually have a small built-in battery that is used to interfere with GPS signals from nearby devices. Larger GPS jammers are typically used on vehicles, boats, or buildings and are designed to cover a larger area or distance.
Cigarette lighter GPS jammer structure
Making a DIY GPS jammer for your car tracker is not an easy task, as it requires a deep understanding of the fundamentals. However, if you are determined to build one, you can disassemble a simple GPS jammer as a reference.
The weakness of GPS signals makes it easy for low-cost jammers to jam them. These jammers do not attempt to mimic GPS satellites, but transmit loud enough noise to drown out the real signal. As a result, legitimate satellite signals become undetectable. When the jammer is activated, the effect on the already weak signal is obvious, as the mode of the device broadcast completely overrides the signal
Now, the only thing to do is to examine its internal components and understand its functionality. Given the low price, it's still amazing to see how something so cheap can cause such significant damage.


On one side of the PCB, we can only identify two key components, the 78M05 regulator that reduces the vehicle's 12-volt power supply to 5 volts, and the infamous NE555 timer known to hackers. Unfortunately, it took the removal of illegal jammers to finally discover one of the most iconic integrated circuits in the history of electronics, but that's the reality.
Radio frequency in vessel
There is no doubt that the component labeled 13BA A041 is the main attraction. So, what is it? Although I was unable to find a datasheet for that particular model, it has been identified as a microwave voltage controlled oscillator (VCO). The metal top we see is actually a shielding material, and with some effort we can examine the surprising array of components crammed into the tiny space of 9mm x 7mm.


The basic working principle of the device is that the control pin of the VCO (identified as VC on the screen) is linked to the output of the 555 timer on the other side of the board. The signal of the 555 timer modulates the output of the VCO, which causes us to observe noise centered on the 1,575 MHz GPS frequency.
By connecting the oscilloscope to the VC pin, we can see the 133 KHz sawtooth signal produced by the 555 timer. Adjusting this signal could change the frequency range in which the jammer operates, but the extent of this possibility is unclear without a VCO data sheet. Since these components are likely to be the cheapest, it is reasonable to assume that the limitations may not be too great.
In addition, it is necessary to study the small four-pin device designated Q6 at the top of the board. When the high frequency signal is passed from the VCO to the center pin of the antenna connector, it is placed directly in the path of the high frequency signal, so it makes sense to use it as an amplifier. However, it can also be used as a diode to protect electronics from anything that might be picked up from the antenna.

What are the frequencies of all GPS signals?
GPS signal frequency band:
GPS L1:1570-1580MHz
GPS L2:1227.60 MHz
GPS L3:1381.05MHz
GPS L4:1379.913 MHz
GPS L5:1176.45MHz
Usually, the civilian frequency band only needs to block GPS L1 L2. Most devices only use GPS L1.

Currently, we are renting a house. The neighborhood becomes very noisy in the late evening, well past midnight, as our neighbors play loud music.
Contacting the police proves to be of no avail. Despite my multiple attempts to seek their intervention, their assurances to send assistance remain unfulfilled. Consequently, I initiated an investigation into signal blockers that solely disrupt wifi signals, not cellular ones. Fortunately, I stumbled upon a device that seems to perfectly meet my requirements.
I must confess that I was initially skeptical about their payment processes. Nevertheless, I soon came to the conclusion that their product was exactly what I had been in search of.
I submitted the payment and waited with patience. The standard shipping policy outlines a delivery period of 7 to 15 days.
After the passage of 15 days, we were furnished with the tracking information. It then proceeded to clear the port and was subsequently taken into the possession of DHL for transportation. In a remarkably short period of 2 days, the package arrived at its designated location.
Once I had taken it out of the box, I proceeded to attach the antennas and connect the charger. It was a pleasant surprise to find that the battery had been fully charged.

We endured a few days of sleep disturbance caused by the unwanted music before taking action. Retrieving the device from the nightstand, I activated it. It is important to note that these neighbors live a few houses away from us. Surprisingly, within a few seconds, the music ceased. Subsequently, I overheard people discussing the issue at hand. In order to investigate further, I left it playing for a solid 20 minutes. Finally, I switched it off and retired to bed.
The jammer device experienced a loud bang and emitted smoke when I charged it for the first time, resulting in irreparable damage. After contacting the company, I was provided with an RMA return number and directed to ship the device to China for repair or replacement. The return shipment cost me an extra $25, on top of the initial payment of over $350 for the device. It took a significant amount of time to receive the restored radio signal jammer.
Indeed, the cell phone signal jammer is a trustworthy business, as you inquired. It appears that some reviews are untrustworthy. I have tangible proof to support my statement.

Cell phone jammers are known for their capability to obstruct incoming and outgoing calls, text messages, and data transfers.
This blog will answer various questions about signal jammers
Are cell phone jammers legal?
mobile jammers are not allowed to be sold, advertised, distributed, or operated in the United States and a significant number of other countries.
In the view of the Federal Communications Commission (FCC), any type of radio communications jamming device that intentionally interferes with "authorized radio communications" is deemed to be a serious threat to vital public safety communications. This interference can potentially hinder your ability, as well as that of others, to make emergency calls such as 9-1-1, while also disrupting the communication networks employed by law enforcement agencies.
Legally protected by the Communications Act of 1934, radio frequencies are safeguarded not only for public safety reasons but also to prohibit any interference with authorized radio broadcasts.
How do cell phone jammers work?
Referred to as cell phone signal jammers, cell phone blockers, signal disruptors, GPS jammers, or text blockers, these devices are used to prevent cellular connectivity in a specific area.
Interfering devices hinder the normal operation of mobile devices by transmitting signals on the same radio frequencies as cell phones. This malicious activity, termed a "denial of service attack," results in mobile devices being unable to function when they are within the range of these interfering devices.
Less refined jammers try to disrupt phone signals by jamming a solitary frequency. This action often deceives mobile devices into believing that no signal is available, consequently rendering them non-operational.
Why use a cell phone signal jammer?

Advocates for such technology maintain that signal blocker device are indispensable in locations where people encounter challenges in following standard cell phone etiquette guidelines. Consider settings like schools, theaters, vehicles, or serene train rides, where engaging in conversations, texting, streaming, and other activities could be perceived as disruptive or potentially dangerous.
It is essential to bear in mind that mobile signal jammers have the ability to not only block voice calls and text messages on mobile phones, but they can also interfere with GPS, WiFi, and even impede the functioning of police radar. This is the reason why the federal government has prohibited the sale, promotion, and usage of cell phone jammers in the United States, as previously discussed.
Will a cell phone signal jammer block a cell phone signal booster?
It is unfortunate that signal jammers can interfere with the proper functioning of your signal booster.
The purpose of signal boosters is to amplify signals that already exist. Nevertheless, if a jammer obstructs the signal, the booster will be unable to perform its intended function.

A 5W adjustable cell phone blocker was acquired by a cosmetology school just outside Dallas to ensure tranquility in the classrooms. This move, coupled with the school's possession of three more jammers yet to be activated, initiated a series of developments that unfolded last week.

Phonejammer.com, headquartered in London, has been on the FCC's radar for quite some time. In 2008, the agency issued a citation to Phonejammer (PDF) due to their marketing of radio frequency devices specifically created to intentionally interfere with cellular and PCS frequencies in the United States.
The company claimed not to be marketing these products in the US, where they are illegal, but FCC staff highlighted that the signal blocker
were priced in US currency, the default shipping location was set to the United States, and the site contained testimonials from US citizens who had purchased phone jammers from Phonejammer. Moreover, the jammers on the site were designed to target US cellular and PCS frequencies.

While you may suspect that the federal government's concerns about your business practices would necessitate changes, this is not the case for Phonejammer. On November 9, 2009, the Federal Communications Commission (FCC) received a complaint, likely from AT&T, regarding cellular interference in the 800MHz and 1900MHz frequency bands. The FCC's Texas field office staff conducted an investigation and determined that the Cosmetology Career Center in Carrollton, Texas was responsible. They found a 5W jammer on the premises (PDF).
Upon contact from the FCC, Phonejammer's lawyer asserted that the company has not shipped or distributed any units to the United States.
Priced at $395, the 5W jammer operated by the Cosmetology Career Center comes with two antennas and a jamming radius of 2-25m. It is capable of blocking PCS, GSM, and CDMA signals between 850MHz and 2100MHz. The website specifies its "operating location" as South America and Africa.
Interestingly, individuals in Texas and Florida are legally allowed to openly carry firearms into a Starbucks, whereas the use of phone jammers is prohibited. As a result, when confronted with a loud cell phone conversation at a nearby table, the only choices are to endure the disruption or consider using a firearm. This situation highlights potential shortcomings in current public policy frameworks.

Modern life essentially requires us to give up data and privacy for everyday activities, from social media use to airport travel (i.e. biometric-based services like Clear and TSA Precheck). These practices extend to our vehicles and, in some cases, our private conversations. As the risk of hacks and data breaches continues, many people are looking for ways to not only reduce data breaches, but also protect themselves from harmful exposures.
Some of the most tempting and easiest ways to go off the grid include GPS jammers and audio or voice protection systems, sometimes called voice cell phone jammer. When you consider these different counter-surveillance devices, it is important to recognize their differences, especially when it comes to legality. gps jammer are illegal devices, while audio jammers are legal and ethical, but their names are inaccurate because they serve completely different functions than their highly illegal counterparts.
GPS Jammer:
GPS jammers were originally designed for government use to hide the location of combat vehicles during high-risk missions. Essentially, a GPS jammer is a small device used to hide your whereabouts from GPS tracking devices that are monitoring your location and activities. GPS jammers emit radio signals on the same frequency as the GPS device, and due to the interference, the GPS tracker cannot determine the location of your vehicle.
They're cheap, easy to conceal, and offer instant protection - GPS jammers seem like a no-brainer. However, their use is prohibited by law, and they can actually be dangerous.
Audio Jammer:
Audio jammers serve a similar purpose to GPS jammers, but in a different way. They are small devices that produce a unique sound to protect confidential conversations from external listening devices. Randomly masking sounds desensitizes microphones in that area, essentially rendering them useless. This extends to many types of microphones and eavesdropping devices, including voice recorders, radio frequency transmitters, hardwired microphones and shotgun microphones. The main goal is to ensure that private conversations remain private, even if the eavesdropper is only a few feet away.

Some online retailers and drone technology companies are promoting RF jammers as tools for deterring drones or safeguarding privacy, circumventing federal laws that prohibit the sale of such devices in the United States.

Rf jammers are devices that interfere with communication systems, usually by sending competing radio signals to confuse nearby electronics. It's a decades-old technology that federal regulators have been trying to crack down on, but interest in jammers persists because people can use them to avoid unwanted drones, disable security cameras or block Wi-Fi networks.

The majority of consumers are showing a lack of interest primarily because of the high price. Large corporations and state government agencies are closely monitoring the increase in drone warfare in Ukraine and Israel, and are preparing for the possibility of domestic drone terrorism.

Could this happen in your backyard? That's a real concern for a lot of people

Numerous people are keen on obtaining this technology, but there are also individuals who are cautious about using it because of the potential impact on controlled airspace.

The versatility of signal jamming device allows for multiple applications, such as confusing unwanted drones, disrupting Wi-Fi networks, and disabling doorbell cameras. Within a Reddit community dedicated to Ring doorbell cameras, some users expressed grievances about individuals using jammers to interfere with the cameras while committing theft to avoid being caught. One Reddit user highlighted the ironic situation where Amazon seems to profit from both sides: Ring operates under Amazon, and Amazon serves as a platform for purchasing devices that could potentially disable Ring's cameras.

Amazon refrained from responding to queries about meddling with Ring devices.

Jammers, also known as RF "blocking," are a commonly discussed subject on online forums that cater to individuals who hold the belief that they are being specifically targeted for extensive surveillance by the government or other entities. This belief or phenomenon is occasionally referred to as "gang stalking."

Discussions surrounding jammers, also known as RF "blocking," are prevalent on online forums that focus on individuals who believe they are being specifically targeted for thorough surveillance by the government or other entities. This belief or phenomenon is sometimes referred to as "gang stalking."

Potential markets for anti-drone blocker, such as RF jammers, involve large companies and organizations that are concerned about drone terrorism but are legally prohibited from using jammers. In a letter to congressional leaders last year, four major sports leagues, including the National Football League, urged Congress to allow state and local law enforcement to utilize anti-drone capabilities.

Some states' prison officials have stated their intention to obtain legal authorization for the deployment of jammers, with the purpose of blocking inmates from using cell phones.

Nonetheless, under the existing legislation, only a limited number of government agencies, such as the FBI, the Department of Homeland Security, and the Departments of Energy and Defense, have been granted the authority to purchase and employ RF jammers.

Enterprises that specialize in drone countermeasures predominantly serve foreign markets.

Highlighting the potential hazards that drones can pose to stadiums, prisons, and airports, drone defense company IXI Electronic Warfare cautions on its website. They claim to possess the capability to swiftly eliminate these threats, utilizing radio-frequency jammers known as Dronekillers. Nevertheless, it is crucial to acknowledge that stadium operators, prison authorities, and airport officials in the United States are not legally permitted to procure such products.

Via email correspondence, the California-based company highlighted their predominant concentration on overseas activities, citing the more relaxed regulatory landscape in those markets. They further clarified that their sales services within the United States are exclusively extended to authorized federal agencies.

The potential spread of such devices in the United States has sparked concerns among experts specializing in counter-drone countermeasures.

The modern market has witnessed a remarkable rise in the demand for WiFi jammers in recent years. These advanced devices play a pivotal role in elevating the level of security and reducing the risks associated with unauthorized access to personal data. When used at home, a wifi jammer can prove to be an invaluable asset. However, it is important to acknowledge the existence of certain universal obstacles. Nevertheless, by configuring the equipment for everyday use, one can effectively safeguard sensitive information from tampering and prevent the theft of valuable data.
The occurrence of an obstruction presents an exceptional opportunity to diminish the risks of unauthorized tracking of personal data. Blockers produce unique signals at the designated frequency, similar to WiFi equipment. As a result, it completely hampers any movement within a given range.
The purpose of these obstacles is to render tracking devices completely useless during their usage. Usually, companies and large corporations employ such blocking equipment to safeguard their confidential information from being revealed to competitors. WiFi signal jammers are reliable and proven devices that offer security and reliability, making them valuable for individuals who prioritize these aspects.
What does an internet jammer do?
WiFi technology is now a ubiquitous means of transferring data across different settings. Although public wireless access points are popular, they are susceptible to various vulnerabilities. One notable vulnerability is the risk of unauthorized access to sensitive information on your device. To safeguard against such threats, it is advisable to employ a dedicated WiFi scrambler.
WiFi technology operates on the 2.4 GHz frequency band, which is widely used by many modern devices due to its cost-effectiveness. However, this frequency range also poses a higher risk to external threats. To counteract this, sophisticated jammers with stylish designs can be employed to block multiple signals simultaneously across different frequency ranges.
A WiFi-blocking device is meticulously designed to intercept signals within a specific range. These devices effectively disrupt wireless signals within their operational distance. In civilian usage, these devices can effectively block signals up to a maximum distance of twenty meters. Conversely, advanced military-grade models possess enhanced capabilities, enabling them to block calls several hundred meters away, thereby preventing the compromise of sensitive data.
Can a jammer block WiFi?
Modern jammers are often used to block WiFi signals. Among the main features of the equipment, you should pay attention to the following:
The utilization of signal blockers guarantees the protection of personal data while preserving privacy on a wireless network.
The tracking capability of various WiFi devices necessitates the use of a blocker to promptly diminish the potential risk associated with your location being identified.
Moreover, with the assistance of various tracking devices, keeping track of your online status is made effortless. Security measures can be strengthened by incorporating a wireless jammer to reduce risks significantly.
The safety and well-being of both their workforce and overall operations are of utmost importance to numerous large-scale companies. Therefore, it is advisable to counteract potential network vulnerabilities by utilizing specialized equipment. An effective approach is to consider compact and portable devices that occupy minimal space, yet offer a wide range of influence to ensure optimal equipment functionality.
Moreover, the device can be utilized within the confines of your own home. For instance, if your children tend to allocate a significant amount of time to playing games or watching cartoons rather than completing their homework, you can opt to block wireless signals, enabling them to concentrate on their studies. It is imperative to select top-notch equipment for your household without exceeding your budget.
Opting to purchase a jammer offers the most effective means of protection against hacker attacks and intruder threats. In our daily routines, we encounter various types of devices, ranging from portable to stationary ones. Despite disparities in size and performance, these devices share a common principle of processing incoming information, thereby amplifying their accessibility and functionality for individuals across the board.
Are WiFi blockers a thing?
WiFi jammers are state-of-the-art equipment that serve diverse purposes. These advanced devices contribute significantly to enhancing security measures and preserving the confidentiality of information. Furthermore, there are multifaceted gadgets available that possess the ability to simultaneously disrupt several signal types, thereby amplifying the overall performance and efficiency of the equipment.

As technology becomes more and more advanced, the use of the Internet is becoming more and more popular for the modern generation. In particular, with the invention of 5G and smartphones, the Internet has ushered in a "golden age." Wi-Fi life has now become everyone's life. It changed the world. The topic about the advantages and disadvantages of WIFI has been very hot. Some people think WIFI makes the world a better and more convenient place; We should use WIFI extensively in our life. While some people think that WIFI and smart phones are not appropriate for some special occasions.
To prevent interference, you know you need a signal jammer to improve your quality of life. While many countries make it illegal to use a cell phone blocker for personal use, be sure to check your local laws before you buy one from a professional blocker online store, and if the laws in your country allow it, you will be entitled to a useful jammer device.
Whether in a class, conference room, presentation, or religious service, calling at the wrong time can be a huge distraction. Cell jammers can stop these calls from coming in the first place. This is what we call preventing interference and unwanted calls or blocking phone noise by using cell phone signal jammers; You will have the power to stop them.
Have you ever been in a situation like this? The phone rang for a long time and no one cared about the interruption. You say loudly, "Please cover your phone." The result is that no one answers you. The unfortunate reality for any large group is that telling people to mute their devices just doesn't work. There will always be a small percentage of people who will leave their devices on for whatever reason.
How to use cell phone blocker to restrict students from using cell phone?
The use of mobile phone signal blockers is worthy of recognition, whether it is to reduce the interference of mobile phones on students' learning, improve the quality of students' learning, or to facilitate school management. You know the truth is that many schools and colleges have installed several different types of cell phone signal blockers so that parents and teachers can let students and children play with their phones. Some students expressed support. Because the use of mobile phones will make mobile phone noise immediately disappear, creating a quiet environment.

The NFL and federal law enforcement are on high alert for unauthorized drones after one caused a play stoppage at a playoff game two weeks ago.
Super Bowl LVIII will feature a tough defensive scheme that has nothing to do with a football. This one is about stopping drones.
The NFL and federal law enforcement officials are taking a hard line Sunday to keep players and fans safe from unauthorized drones at Allegiant Stadium in Las Vegas where the Kansas City Chiefs will play the San Francisco 49ers.
Unapproved drone flights have become a persistent problem for the NFL, as well as for other sports leagues and large public gatherings. The NFL said there were about 2,500 drone incursions near stadiums during the 2022-2023 season, an increase of about 90% from a year earlier.
The flights have sometimes encroached on televised broadcasts, including two weeks ago at the AFC championship game in Baltimore when an unapproved drone violated the restricted airspace. Federal prosecutors later charged a Pennsylvania drone pilot who said, according to the FBI, that he wasn’t aware of the flight restrictions.
Possible criminal charges and civil penalties await anyone trying something similar Sunday, officials said.
“So please leave your drone at home,” Cathy Lanier, the NFL’s chief security officer, said at a news conference Wednesday.
Most of the drones are operated by hobbyists seeking aerial video, according to experts, but especially at a high-profile event such as the Super Bowl, authorities said they’re also looking out for people with more nefarious intentions.
Homeland Security Secretary Alejandro Mayorkas said the incident two weeks ago was a warning.
“It does not require much imagination to understand the significant threat such an incident could pose,” he said at the news conference Wednesday. Although no one was hurt in that incident, he said, “what happened in Baltimore underscores the vital importance of the mission.”
Mayorkas added that there were no known credible specific threats to the Super Bowl or Las Vegas.
Federal law enforcement designates the Super Bowl as a top-tier security event, on roughly the same level as a presidential inauguration ceremony or a visit by the pope. Allegiant Stadium, where the teams will play, has a capacity of about 65,000 people.
Any stadium’s defense against drones has multiple layers, said Mary-Lou Smulders, chief marketing officer for Dedrone, a Virginia-based company. Its drone countermeasure technology is in use by the Las Vegas Metropolitan Police Department, which covers Las Vegas and its major stadiums.
“Like any security issue, the more layers you add, the safer you are,” she said. “The same applies to airspace security.”
The first layers, she said, are all designed to detect and track drones using at least three types of technology: radio-frequency sensors, cameras and radar. They have different strengths, she added: Radio-frequency sensors can distinguish between drones and other objects better than radar, while radar has a longer range and a camera can help determine if a drone is carrying a payload.
With a camera, Smulders said, “the most interesting thing to ask is: Is it carrying a payload, yes or no?” If it were, that “would dramatically affect your security posture.”
A second set of layers is designed to interfere with a drone’s flight, she said: “cell phone jammer jamming” or cutting off the radio communication between a drone and its pilot; hacking into a drone to take over control; and locating the pilot on the ground and arresting the person.
drone jammer Jamming and hacking are not usually available as security tools for an NFL game. Federal law restricts who can interfere with a drone’s flight, and in the United States, only a few government agencies including the Department of Homeland Security and the FBI have the authority to do so. Congress is considering legislation to change that but, for now, the federal government provides agents for high-profile events like the Super Bowl but not for a game on any given Sunday.
At a regular season game in Baltimore in November, play was delayed twice because of drone activity.
The NFL game stoppages are helping raise the profile of drone countermeasures, a growing industry that experts say will become more important as drone technology improves and becomes cheaper.
Allegiant Stadium has one advantage over Baltimore’s: It’s a domed stadium, with a roof to shield the game from anything overhead. But it’s not completely enclosed, Smulders noted: The stadium has 80-foot walls that are retractable if weather allows. The doors have usually been closed during games.
Still, the NFL is on higher alert for drones than it used to be. In 2017, a California man used a modified drone to drop leaflets on the 49ers stadium, authorities said. He then drove to nearby Oakland and did the same at a Raiders game. He later pleaded guilty and was sentenced to probation.
For Sunday, the Federal Aviation Administration has banned drones within a radius of 30 nautical miles (about 35 miles) of the stadium beginning one hour before kickoff. There have also been restrictions in place for additional events in Las Vegas the past few days.
Lanier has previously told NBC News that the NFL had a close call at the Super Bowl in Atlanta in February 2019, when an FBI team spotted a drone just before six Air Force F-16s were set to conduct a flyover before the game. The F-16s flew at a higher altitude to avoid a possible collision, she said.

Illegal GPS signal jamming can disrupt local GPS devices and cell phone towers, according to UK reports.
TechWeek Europe reported an uptick in signal jamming incidents based on the results of the Sentinel study, which were shared at the GNSS Vulnerability 2012 conference held at England's National Physical Laboratory on February 22. Roadside monitoring stations recorded a total of 60 violations within a six-month period.
Sean Gallegher, writing in Ars Technica, reported on the dangers of interrupting GPS signals. Cell phone systems and even electrical grids rely on GPS signals for time-keeping. Jammers built for auto use to obscure location can affect other devices from 100 yards away and more. Powerful jammers can disrupt signals as far away as 32 kilometers. Yes, jammers have caused problems at airports already. They are illegal to use, but legal to own, in the UK.
 

 
Surprise
I had no idea little GPS jammers could cause so much havoc though.
clackerd on arstechnica.com
why would you want to jam the GPS signals? If you’re not doing anything wrong then yu have no reason to worry.
Angel Investors on techweekeurope.co.uk
 
 
First hand
I know a guy who bought that exact jammer in the picture. I think it was a little over $100 shipped from China. It works. It kills my AT&T iPhone dead. It kills his Sprint phone. It killed everything except one device he's ever tried to test with.
Dilbert on arstechnica.com
The more sophisticated jammers don't cause "noise", but rather they record and replay the pseudorandom generated digits they receive from the various frequencies and time drift them.
zbowling on news.ycombinator.com
Jammers for car usage like this one are used by people to protect their privacy and not to harm vital infrastructures of the city.
Alex White on techweekeurope.co.uk
in 2009 the Newark airport had a daily GPS failure that was finally traced to a trucker using a jammer, presumably to defeat a tracker enforcing safe driving rules.
NelsonMinar on news.ycombinator.com
 
 
Authorities and warnings
But... in the end... it mostly just made me want to buy a GPS jammer.
primordius on arstechnica.com
The more we allow our public movements to be tracked, and the more control and oversight we grant the government and corporations, the harder it will become for the public at large if there should ever come a time when they want some of that power back.
Crane on techweekeurope.co.uk
How vulnerable are Google's self-driving cars to GPS jamming?
GiraffeNecktie on news.ycombinator.com