The new cell phone signal blocking system is equipped with an advanced computer system that can scan the prison area in real time and identify illegal mobile phone signals. https://www.silencejammer.com/gps-jammer-blocker-car-signal The operating principle of this system is to effectively prevent prisoners from communicating and coordinating criminal activities inside the prison by interfering with the communication between the prisoners' mobile phones and the base station. https://www.silencejammer.com/wifi-jammer-bluetooth-blocker-device The realization of this technology is inseparable from strong technical support and continuous monitoring. As one expert pointed out, the gendarmerie must constantly monitor new illegal signals and add them to the blacklist to ensure the effectiveness and reliability of the system. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker

　　The balance between security and privacy

　　While the main purpose of the technology is to enhance the security of prisons, the quality of life of surrounding residents must also be taken into account. Engineers said that if the antenna direction of the signal interference is properly designed, it will not affect the daily life of nearby residents. Such a design concept not only shows the importance of public safety, but also reflects the respect for the rights of residents. Through reasonable technical deployment, this system can effectively block mobile phone signals inside the prison without affecting the surrounding environment.

　　Expected results and challenges

　　When announcing this measure, Chilean President Gabriel Boric emphasized that the introduction of the mobile phone signal blocking system will effectively curb the ability of prisoners to coordinate criminal activities in prison. The implementation of this system marks an important step for Chile in prison management. However, the implementation of this system is not without challenges. How to effectively manage and maintain this high-tech equipment to ensure its long-term effective operation is one of the focuses of future work.

　　Finance and implementation plan

　　It is reported that the Chilean government will spend more than 3 billion pesos this year just to block mobile phones in the Pedro Monte area. Full coverage of 81 correctional institutions across the country requires an investment of up to 600 billion pesos, which undoubtedly poses a challenge to the national finances. Therefore, the government decided to prioritize 15 key projects to achieve the goal between 2024 and 2025. Such financial arrangements not only reflect the government's emphasis on prison security, but also demonstrate the flexibility of implementing scientific and technological projects within a limited budget.

As the phenomenon of prisoners using mobile phones to continue to manipulate crime spreads around the world, Argentina's Santa Fe Province has taken new measures to introduce cell phone jammers in Pinheiro Prison No. 11 near Rosario. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker This move is considered an important means to reduce the connection between prisons and external crimes and is aimed at responding to the increasing number of shootings in Rosario.
　　Rosario's security crisis
　　In recent years, Rosario's security situation has become increasingly severe, with frequent shootings, and many violent incidents are related to the command of prisoners in prison. https://www.silencejammer.com/gps-jammer-blocker-car-signal .According to statistics, in March 2023 alone, eight of the ten shootings in Rosario were ordered from prison, including a shooting in the supermarket of football star Lionel Messi's father-in-law. This situation has caused great public concern about prisoners continuing to manipulate external criminal activities through their mobile phones. https://www.silencejammer.com/wifi-jammer-bluetooth-blocker-device
　　In response to this problem, the Santa Fe Provincial Government decided to install a new cell phone signal jammer system in Pinheiro Prison to cut off prisoners' communication with the outside world. https://www.silencejammer.com/
　　How the jammer works
　　The newly installed signal jammer system consists of eight devices that transmit jamming signals through antennas, blocking the phone from connecting to external communication networks. In short, prisoners using mobile phones inside the prison will not be able to connect to any communication network and will be "offline".
　　According to Claudio Briloni, Santa Fe's Secretary of Security, the system is designed to ensure that communications inside the prison are strictly controlled, with limited contact with the outside world only through fixed telephone lines. This method of communication will effectively reduce the chances of prisoners directing external crimes, thereby reducing the violent crime rate in Rosario.
　　Technical challenges and adjustments
　　Although the introduction of this system is seen as an important step in the fight against crime, there are still some technical challenges in its actual operation. For example, the installation and testing phases of the system required several adjustments to ensure that the jamming signals were limited to the prison and did not spread outside the prison and affect the communications of innocent citizens.
　　The experts responsible for setting up the system pointed out that the installation positions of the antennas have been strategically arranged to cover the security perimeter of the prison while avoiding interference with the signals in the surrounding areas. At present, the system is in its initial stages and will continue to undergo different tests and calibrations in the future.
　　The government's long-term plan
　　In addition to Pinheiro Prison, the Santa Fe provincial government also plans to install similar signal jammers in other prison facilities, including Las Flores and Coronda prisons. The move is part of the governor's crackdown on criminal activities in prisons and aims to reduce the ability of prisoners to conduct criminal commands through mobile phones.
　　In addition, the government also plans to add additional antennas to the existing system as 5G technology becomes popular to ensure that the jammers can adapt to future communication technology developments.

As technology continues to evolve, signal jammers are becoming a tool for criminals and terrorists, an issue that received heightened attention at an Indiana legislative ad hoc committee hearing on September 10, 2024. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker Vanderburgh County Sheriff Noah Robinson testified in detail about the potential security threats posed by the use of signal jammers and called on lawmakers to take urgent steps to strictly regulate these devices. https://www.silencejammer.com/gps-jammer-blocker-car-signal
　　Hidden dangers of terrorism: the dual threat of signal jammers
　　Sheriff Robinson warned at the hearing that signal jammers not only pose a threat to daily law enforcement operations, but could also be used by terrorists and other malicious actors for larger sabotage operations. https://www.silencejammer.com/
　　"One doesn't have to look too far to find other uses for signal jammers, especially in terrorism," Robinson warned. https://www.silencejammer.com/wifi-jammer-bluetooth-blocker-device He listed several potential scenarios that demonstrate the dangers of these devices in public safety. For example, malicious actors could use signal jammers to interfere with medical equipment in hospitals, affecting treatment efforts; they could also hinder police communications through radio interference, or even cause large-scale traffic chaos by interfering with traffic signals.
　　These warnings highlight the potential use of signal jammers in terrorism, prompting lawmakers to rethink whether these devices need to be more strictly regulated.
　　Illegal Market for Signal Jammers: Easy Availability Raises Concerns
　　Although federal law explicitly prohibits the use and sale of signal jammers, these devices are still available on the black market and online. Robinson pointed out that although current federal law has made relevant prohibitions, law enforcement agencies at the state level still lack sufficient power to deal with such cases.

Drug lords "still control operations in Bilibid" using smuggled phones - Phone smuggling in New Bilibid Prison, Philippines

　　Background and Overview of Issues

　　On September 9, 2019, the Philippine Senate held its fourth hearing on the Good Conduct Time Allowance Act (GCTA). At this hearing, Arsenio Evangelista, chairman of the Volunteers Against Crime and Corruption (VACC), revealed a shocking fact: drug lords in the New Bilibid Prison (NBP) in the Philippines continue to control drug trade inside and outside the prison through smuggled phones. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker This issue not only highlights the loopholes within the Philippine prison system, but also exposes how the illegal drug trade continues through modern technology, while the signal jammers deployed by the government at a huge cost have failed to effectively curb this phenomenon. https://www.silencejammer.com/gps-jammer-blocker-car-signal

　　Challenges of the Drug War

　　Philippine President Rodrigo Duterte's war on drugs has attracted widespread attention at home and abroad. https://www.silencejammer.com/However, Evangelista pointed out that if the problem of phone smuggling in Bilibid Prison is not resolved, Duterte's war on drugs may end in failure. According to Evangelista, about 80% of illegal drugs come from drug lords in the New Bilibid Prison. Although these drug lords are behind bars, they keep in touch with the outside world through illegally smuggled mobile phones and continue to control the circulation network of drug trafficking. This phenomenon is worrying and reveals major flaws in the management of the Philippine prison system.

　　During the hearing, Senator Panfilo Lacson shared his conversation with retired police general Benjamin Magalong. Magalong recalled the 2014 raid on Bilibid Prison and pointed out that the flow and trade of drugs are actually controlled from inside the prison. These drug lords give orders through smuggled mobile phones, which leads to the spread of drugs nationwide. Although the government has spent a lot of money to install signal jammers, it seems that it has not really stopped the use of mobile phones and the continuation of drug trafficking.

　　The price and market of smuggled mobile phones

　　In the New Bilibid Prison, the price of smuggled mobile phones is high. According to informants cited by Evangelista, the price of ordinary 2G and 3G mobile phones is as high as 500,000 to 700,000 pesos, while the price of high-end smartphones has climbed to 2 million to 2.5 million pesos. Behind these high prices, there is obviously a mature and lucrative black market industry chain. Prisoners continue to manage drug trafficking and criminal activities outside the prison through these phones, making mobile phones an extremely valuable and strategic tool inside the prison.

　　This phenomenon not only highlights the prevalence and importance of mobile phones in modern society, but also shows that regulatory loopholes inside prisons are being exploited by organized criminal gangs. The transaction of smuggled mobile phones involves not only prisoners inside the prison, but also may involve corruption among some prison administrators, which makes the problem more complicated.

　　Failure of signal jammers and management loopholes

　　Although the Philippine government has installed signal jammers inside Bilibid Prison in an attempt to block prisoners from using mobile phones, the effect of these jammers does not seem to be ideal. According to Evangelista, these jammers are turned off at certain times of the day to allow prisoners to continue using their phones. Such incidents show that there are obvious loopholes in the implementation of the mobile phone ban policy in prisons. This not only reflects the failure of technical means, but also suggests that there may be a certain degree of corruption or dereliction of duty within the prison management.

　　Senator Lacson further questioned the management of signal jammers during the hearing. He asked, "Who controls the jammers? Who can profit from it? Can even the technicians profit from it?" These questions reveal the potential gray area of ​​jammer management and hint at possible corruption within the prison. Obviously, relying solely on signal jammers cannot solve the fundamental problem, and the government needs more comprehensive policies and management measures to meet this challenge.

　　Social Media Use and Public Activities of Drug Lords

　　During the hearing, Lacson showed a screenshot of a public post on Facebook by prisoner Raymond Dominguez. Dominguez was sentenced for robbery and murder, but he was still able to use a mobile phone in prison and post information through social media platforms. Lacson pointed out that other well-known prisoners also posted publicly on Facebook, further proving that the problem of mobile phone smuggling in prisons has seriously affected the security management of prisons.

　　This phenomenon reveals that drug lords not only use mobile phones to continue to control drug transactions, but also interact with the outside world openly through social media and even show off their activities in prison. This public activity has raised questions about the rigor and effectiveness of prison management and has also triggered widespread criticism of the Philippine prison system.

　　Inter-agency cooperation and law enforcement challenges

　　Evangelista mentioned at the hearing that he had discussed with Aaron Aquino, director of the Philippine Drug Enforcement Agency (PDEA), questioning why no action was taken to address the problem of mobile phone smuggling in prisons. Aquino responded that the PDEA had an office in Bilibid Prison, but it was later abolished, which may have weakened the crackdown on drug trafficking inside the prison.

　　On September 15, 2024, Thai police successfully cracked a case of stealing cars using signal jammers at the highway rest area in Bang Pakong County, Chachoengsao Province, and two Chinese suspects were arrested on the spot.https://www.silencejammer.com/mobile-jammer-cell-phone-blocker This incident has aroused widespread public concern about the illegal use of signal jammers, and also demonstrated the severe challenge of modern technology being used as a theft tool by criminals.

　　Background of the case and criminal methods

　　The police said that the core of this case was that criminals used remote control signal jammers to interfere with the signal of the owner's car lock to commit theft. https://www.silencejammer.com/ Before the incident, the Chachoengsao police received multiple reports that vehicles were damaged and valuables in the car, especially credit cards, were stolen at the Bang Pakong highway rest area, which seriously affected the sense of security of users on the route.https://www.silencejammer.com/gps-jammer-blocker-car-signal

　　The police quickly launched an investigation and identified the suspects through surveillance videos. The gang members are two Chinese men, 38-year-old Zhang and 31-year-old Zheng. https://www.silencejammer.com/wifi-jammer-bluetooth-blocker-device They have been committing crimes in the area for a long time, and their division of labor is clear: one is responsible for using signal jammers, and the other is responsible for covering and transferring stolen items. The suspects were successfully arrested by the police when they took action again on September 15.

　　Police action and arrest of suspects

　　The Bang Pakong police in Chachoengsao Province worked closely with the Central Investigation Police to set up control at the crime scene on September 15 and arrested the suspects when they tried to break into two cars. After the criminals were arrested, the police immediately searched their homes and found tools used in the crime, including a remote control signal jammer, three mobile phones, a shoulder bag, a car key and the vehicle used in the crime.

　　The widespread use of drone technology in modern warfare has become a reality that cannot be ignored. Especially in conflict areas, small and micro drones are frequently used for reconnaissance, attacks and interference activities due to their flexibility, low cost and difficulty to detect. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker In response to this threat, NATO held a military exercise called "Ramstein Legacy" in Romania in June 2024, focusing on testing anti-UAV tactics and equipment. https://www.silencejammer.com/ Despite the various challenges in reality, this exercise still provides valuable experience for the development of NATO's future anti-UAV strategy.

　　Purpose and background of anti-UAV tactical testing

　　NATO's main goal in this exercise is to verify the defense capabilities of its existing anti-UAV system against first-level drones (including small, micro and ultra-small drones). In modern warfare, drones have become a weapon of asymmetric tactics. https://www.silencejammer.com/gps-jammer-blocker-car-signal Their low cost and easy operation allow the enemy to threaten NATO's defense system through simple means. Therefore, NATO must constantly update its tactics to cope with this constantly changing threat. https://www.silencejammer.com/wifi-jammer-bluetooth-blocker-device

　　The exercise was held from June 3 to 14, 2024, with participating countries including Romania, Germany, France, Turkey, Poland and other countries. In addition, several technology companies from the United States, France and Germany also participated in it, demonstrating their latest anti-drone technologies. The countries not only tested anti-drone detection equipment, but also conducted a variety of actual combat simulations to verify the practicality of these systems in complex battlefield environments.

　　Key technologies and operations in actual combat simulations

　　In this exercise, officers from the Italian C-UAS Center of Excellence played the role of the "red team" (enemy), responsible for operating various drones to simulate the attack methods of hostile forces. The drones they used included the Chinese-made DJI drones and the American Parrot Disco, which have high flight performance and concealment, and can effectively test the detection and interception equipment of NATO member states.

　　The first stage of the exercise was mainly to familiarize themselves with infrastructure such as electronic warfare equipment, radar and command and control systems. Subsequently, participants gradually entered the actual combat exercise stage, simulating various complex drone attack scenarios. These scenarios include drone group attacks, ground concealed starting point launches, and multi-system coordinated attacks. Through these highly simulated combat environments, NATO member states verified the performance of their anti-UAV systems in actual combat.

　　Real challenges and interference factors in the exercise

　　Although the exercise has made significant progress overall, it is inevitably affected by real interference factors. These challenges mainly come from complex battlefield environments, such as radio interference and changeable climate conditions in the Black Sea region. These real interferences have an impact on the performance of radar detection and electronic warfare equipment, especially in high electromagnetic interference environments, the reaction speed and interception accuracy of some systems have decreased.

　　The global positioning system (GPS) has become a key link in modern military operations. From tactical positioning to the use of precision-guided weapons, GPS is everywhere. However, with the continuous evolution of countermeasure technology, the vulnerability of GPS has been increasingly exposed. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker The technical competition between the United States and Russia over GPS jamming and anti-jamming has become an important part of future wars. https://www.silencejammer.com/ This article will explore in depth the anti-jamming upgrade of the third-generation GPS satellites in the United States and the rise of new Russian jamming equipment, and analyze the confrontation and development between the two countries in this field. https://www.silencejammer.com/gps-jammer-blocker-car-signal

　　Vulnerability and upgrade of the US GPS system

　　Although the US GPS system has long maintained a leading position in technology, the weakness of its signal has long been discovered by its opponents. https://www.silencejammer.com/wifi-jammer-bluetooth-blocker-device Especially in military operations, weapon systems that rely on GPS, such as cruise missiles and drones, have exposed their vulnerability to interference. The most typical example occurred during the Iraq War, when the GPS jamming equipment provided by Russia significantly reduced the hit rate of long-range weapons such as the US military's "Tomahawk" cruise missiles. The successful use of the jamming equipment even attracted strong attention from US President Bush.

　　The United States realized this defect and began to invest a lot of money and technical resources to upgrade the GPS system's anti-jamming. The advent of the third-generation GPS satellites marks an important step for the US military in the field of anti-interference. These new satellites are specially designed with M codes to defend against interference signals. Compared with traditional C/A codes (civilian codes) and P codes (military codes), M codes can achieve higher anti-interference capabilities, and military signals are completely separated from civilian signals, which improves security in military applications.

　　Another breakthrough design of the third-generation GPS satellite is the redistribution of signal transmission power. This technology enables the US military to control GPS signals in specific areas as needed, shielding enemy civilian signals while retaining encrypted military signals used by its own side. This capability will enable the United States to control GPS signals more flexibly in future wars, adding a new layer of protection to its military advantage.

　　The rise of Russian GPS jammers

　　At the same time, Russia has not stopped researching and countering the GPS system. In recent years, the "Magnetic Field-21" electronic jamming system developed by the Russian Electronic Countermeasures Science and Technology Center has attracted widespread attention. This system can effectively shield GPS signals in the entire area through the R-340 RP radio jammer station installed on a cellular communication tower. Compared with previous jamming equipment, "Magnetic Field-21" has a wider coverage and stronger jamming effect, especially in protecting important Russian military targets and national strategic facilities, playing a key role.

　　It is worth mentioning that Russia's new jamming equipment is not only effective against the US GPS system, but also poses a potential threat to satellite navigation systems around the world that use the same frequency, such as the EU's Galileo and China's Beidou system. This means that in the future, global GPS signal jamming may not only be limited to the confrontation between the United States and Russia, but may also spread to other countries and regions, and even affect civil flights and daily navigation.

　　The spread of global GPS jamming equipment and future challenges

　　With the continuous advancement of GPS jamming technology, the spread of related equipment is also accelerating. Nowadays, ordinary people can even buy or make simple GPS jamming equipment online, which poses a severe challenge to the security of the global navigation system. For countries whose military forces are highly dependent on GPS, such as the United States, how to deal with this growing threat has become a problem that must be solved.

　　Conclusion

　　In future wars, the competition between GPS jamming and anti-jamming technology will become increasingly important. The advent of the third generation of GPS satellites in the United States has provided it with stronger anti-interference capabilities, but the interference technology of Russia and other countries is also constantly developing, and the competition between the two sides is still continuing. As the technology in this field continues to evolve, military forces around the world must consider how to ensure their combat capabilities and strategic advantages in an environment where the GPS system is vulnerable.

　　1. Background and implementation motivation of the mobile phone blocking system

　　In Chilean prisons, the illegal use of mobile phones has always been a serious problem. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker Prisoners continue to participate in criminal activities through illegally obtained mobile phones, and even coordinate transnational crimes, plan fraud and other illegal acts. To address this problem, the Chilean government passed a law in 2018 to allow the installation of signal jammers in prisons. https://www.silencejammer.com/ However, due to technical and budgetary constraints, the implementation of the law has been slow.

　　With the increasing rampant criminal activities carried out through mobile phones in prisons in recent years, the Chilean government decided to speed up the deployment of the blocking system. https://www.silencejammer.com/gps-jammer-blocker-car-signal In March 2024, the new mobile phone blocking system will be fully launched, covering the three main prisons in the metropolitan area: Santiago South Preventive Detention Center, Santiago I Preventive Detention Center and the Special High Security Prison Facility. In a statement on November 28, 2023, President Gabriel Borich emphasized that these blocking systems are installed to "block mobile phone signals in prisons, thereby preventing criminal activities from continuing to be coordinated in prisons."

　　2. Technical principles and operation of the new blocking system

　　Unlike traditional signal jamming technology, the new blocking system introduced in 2024 has higher accuracy and selectivity. Traditional jamming systems usually block mobile phone signals throughout the prison area, which not only affects prisoners, but also causes inconvenience to prison staff and surrounding residents. The new blocking system selectively blocks prisoners' mobile phone signals by identifying each device within a specific radius.

　　This more sophisticated jamming technology can effectively avoid signal interference with prison staff and nearby residents. At the same time, it can also ensure that law enforcement officers such as the gendarmerie can communicate unimpeded without affecting daily prison management. The use of this new technology shows that the Chilean government has reached a higher level of technology in the selection and application of signal jammers, which will help improve the efficiency and safety of prison management.

　　3. Budget and coverage challenges

　　Despite the technological advancement of the new shielding system, its high implementation cost remains a major challenge for the Chilean government. According to Deputy Minister of Justice Jaime Gajardo, the Chilean government will invest more than 3 billion pesos in 2024 just to block mobile phone signals in the Pedro Monte area. If this plan is to be expanded to 81 correctional institutions across the country, the total operating budget will be as high as 600 billion pesos, accounting for one-third of the budget of the gendarmerie.

　　Due to the huge cost of this project, the Chilean government can only give priority to 15 of the prison institutions for full deployment. In the next few years, the government will continue to seek financial support to achieve the initial goals of this plan between 2024 and 2025. According to estimates, the shielding system will cover 50% of the prison population in the country, which will greatly reduce the opportunities for prisoners to use mobile phones for criminal activities.

　　4. Impact on the lives of prisoners and social security

　　The implementation of the mobile phone blocking system has had a significant impact on the daily lives of prisoners. In the past, prisoners kept in touch with the outside world through mobile phones and used these illegal communication channels to plan criminal activities. The introduction of the blocking system cut off this illegal channel, forcing prisoners to rely on the prison's public telephone system, and their contact with the outside world was greatly restricted.

　　From a social perspective, this measure has effectively curbed criminal activities in prisons, especially the significant reduction in fraud and extortion cases. In addition, the quality of life of residents outside the prison has been guaranteed, complaints caused by signal interference in the past have been reduced, and daily communications of surrounding residents have been restored to normal.

　　5. Future Outlook

　　Although the mobile phone blocking system has made significant progress in technology and application, the Chilean government still faces many challenges. Budget constraints have limited the coverage of the blocking system, and how to ensure the long-term maintenance and updating of the equipment is also a problem that needs to be solved in the future. In addition, as technology develops, prisoners may find new means of communication, and the government also needs to adjust its strategy at any time to deal with new security threats.

In recent years, more and more countries and regions have begun to implement prison signal shielding systems to prevent prisoners from using mobile phones to commit crimes through illegal means. https://www.silencejammer.com/mobile-jammer-cell-phone-blocker This technical measure is considered an effective means to curb telecommunications fraud, drug trafficking and other criminal activities in prisons. However, the actual operation and effectiveness of signal shielding technology often face many technical challenges and social impacts.https://www.silencejammer.com/gps-jammer-blocker-car-signal

　　1.1 Background: The necessity of preventing criminal activities in prisons

　　With the widespread popularity of smartphone technology, many prisoners obtain mobile phones through illegal means and use these devices to carry out various criminal activities. https://www.silencejammer.com/ Mobile phones in prisons can not only be used to contact the outside world and plan escapes, but also to command external criminal gangs to conduct illegal transactions, fraud and even violent activities. Many countries have therefore begun to explore how to effectively block mobile phone signals inside prisons to curb the spread of these illegal activities.https://www.silencejammer.com/wifi-jammer-bluetooth-blocker-device

　　Chilean President Gabriel Boric proposed in 2023 that the government will take technical measures to prevent prisoners from using mobile phones to prevent further planning of crimes in prisons. The introduction of this measure indicates that governments attach great importance to the problem of illegal use of mobile phones in prisons.

　　1.2 Technical challenges and application status

　　The implementation of signal shielding technology is not smooth sailing. Although this technology can effectively block mobile phone signals in theory, it faces many problems in practical application. First, the coverage of the shielding signal needs to be very precise to avoid affecting the community outside the prison. When the Chilean government implemented this measure, it encountered complaints from some residents living near the prison, accusing the signal shielding system of affecting their normal communications. This shows that the shielding technology needs to set the coverage area more accurately to ensure that it is only targeted at the inside of the prison and does not affect innocent residents around.

　　In addition, the cost of signal shielding equipment is also an issue that cannot be ignored. For example, the cost of implementing shielding equipment in the Pedro Monte region of Chile alone reached 3 billion pesos. According to government estimates, the total cost required to cover prisons across the country will exceed 600 billion pesos, which is equivalent to one-third of the annual budget of the gendarmerie, which is obviously beyond the country's financial capacity. Therefore, when promoting this measure, governments must make a trade-off between cost and benefit and give priority to those prisons where criminal activities are most rampant for pilot projects.

　　1.3 Improvement direction of shielding system

　　With the advancement of technology, future shielding systems will be more intelligent. For example, the current signal blocking system can identify and lock devices in a specific area and conduct targeted interference on prisoners' mobile phones without affecting other administrative staff and surrounding residents. This "selective blocking" technology is expected to reduce the impact on unrelated people outside the prison and improve the effectiveness of the system.

　　Although there are still many technical challenges, the need to block signals is still urgent. Take Chile as an example. By the end of 2023, more than 2,000 illegal mobile phones had been seized in prisons, and more than 3,000 attempts to make calls and connect to the Internet had been blocked by the signal blocking system. These data fully demonstrate the great potential of mobile phone blocking technology in curbing crime in prisons.

　　Part II: Social Impact and Controversy of Prison Signal Blocking System

　　Although the prison signal blocking system plays an important role in combating prisoners' use of mobile phones to commit crimes, the implementation of this technical measure has caused widespread controversy in society. In particular, residents living near some prisons complained that their mobile phone signals were also interfered with. This issue highlights the side effects of the signal blocking system and brings about discussions on balancing public safety and civil rights.

　　2.1 Impact of signal shielding on surrounding residents

　　Since signal shielding measures have been gradually implemented in prisons in various countries, many residents living near prisons have begun to complain that their daily communications have been interfered with. In Chile, the Telecommunications Regulatory Agency (Sutel) has received complaints from residents in different regions, stating that their mobile phone signals have become unstable or even completely unusable due to the implementation of prison signal shielding systems. Similar complaints are mainly concentrated around the prisons in Alajuela and San José, as well as near Limon Prison.

　　Behind these complaints, the actual challenges of signal shielding technology in application are reflected. Although the original intention of this technology is to prevent prisoners from using mobile phones to commit crimes, its impact on innocent residents in the surrounding area cannot be ignored. This has also prompted governments and technology suppliers to adjust their equipment to reduce unnecessary signal interference.