Home Product List Cellular Jammer

Cell phones are becoming a problem because they are used in places where they shouldn’t be. Sure we like to feel connected all the time, but there are some clear cases where cell phones should be limited. There are other places where land owners would like to limit cell phone use. This has led to a rash of illegal jammers in the market place. They are active in churches, theaters, music halls, and funeral homes. The biggest fault with these devices is 911 calls are blocked as well as critical calls such as from babysitters.

Sagrad has technology which can distinguish between 911 calls and regular calls. Depending on the situation, we can also compare the incoming call to an “approved” list. This technology will allow us to provide jammers which turn off at the first 911 call and allow all out going calls after a 911 call is placed.

The purpose of this technology is to provide an option for people who wish to avoid the legal issues if a 911 call is jammed and the result is someone dies. Clearly 911 calls should be allowed to be placed.

While it is currently illegal, we propose people who operate businesses should be able to jam phones on their property as long as they can insure the signals will not interrupt anyone else. The people who operate jammers must shut them off if they receive complaints from neighbors. We think this is fair, but it goes against the law and a mountain of influences from people making money from the spectrum.


  1. What are some areas where cell phones should be jammed?

    Our best example is operating rooms. We understand some careless doctor carried on a cell phone conversation during an operation which resulted in the death of a patient. Clearly not all doctors can help themselves, and more forceful measures are needed.

    There are areas where cell phones should be limited; these include areas where the cell phone could be used to listen in to government or high level corporate conference rooms. In these cases the cell jammer can be turned on or off.

  1. Why is it illegal to jam calls?

    Basically, when the FCC auctions off spectrum, the value of this spectrum is much higher if the winner is allowed to use the spectrum with the authority to kick anyone else out of their spectrum. The FCC even has a team of people who go around looking for jammers, intentional and unintentional.

    This is sort of like the air space above your house. You can not require commercial airliners to fly around your house. You can not tax them and you can not install towers to stop them from flying over your house. The spectrum is property, claimed by the government, sold on your behalf for your benefit.

    Without this protection from jammers, the spectrum will not sell for high prices currently fetched by these sales.

    We argue that people should not be talking in places like movie theaters. There is no call volume, therefore there should be no loss in carrier revenue. The only concern is loss of contact. This can be worked around by allowing text messages to notify users of missed incoming calls. Carriers will likely be against this approach, because they do not want their customer’s phones being used by land owners.

    The best solution is for the cell phone carriers to self regulate and provide the service to these areas by working with Sagrad. This allows for complete control of the user experience. In this case the user can be notified of an incoming call without rude interruptions.

  1. How does our technology work?

    Our hardware (which can not currently be legally sold to US Citizens) only interrupts calls at the start. If the call is detected to be an emergency 911 call or on the approved list of callers, then the interruption can be disabled. If a 911 call is detected, the preferred mode is to disable all interruptions and allow all calls to proceed normally until interruptions are manually re-enabled because it is assumed that an emergency is in progress.
  2. How much would this product cost?

    About 5K if we built a lot of 100.
  3. What is the coverage of this box?

    A single box could cover about 4 theater screens. The limitation is not in the range, it is in the ability to detect where the phone is. We wouldn’t want to jam calls in the flower shop next door. The goal would be to cover a theater, church or operating room. The jamming size can be adjusted.

  1. Why can you not sell or advertise these?

    It would be illegal to do so, as required by the FCC. We can not sell units for private use in the US. Government, and special organizations like law enforcement have the ability to purchase and use these jammers.
  2. Do you have a demo of this technology?

    On special request we could demo a prototype of this technology at our facility. This would be uncommon and only after a business case was clear. We could complete this using an experimental license and a closed network to allow us to meet all requirements of the law.
  3. Why have you provided this information?

    We would like to provide this hardware for sale to increase the quality of life. We feel churches, theaters, and operating rooms should be void of cell phones. In order to do this we need to change the laws. The more we can educate people on the subject the higher the chances are that we can get the law changed. If the law is changed we can legally sell this hardware.
  4. Will you sell this hardware to me?

    Not unless you can demonstrate you are allowed to legally operate one. We are not flexible.
  5. Can you send a text message that I have an incoming call?

    This is possible, but would be best solved through cooperation with the carriers who recognize that providing this service will increase user satisfaction and would work with us to provide all the information needed to complete this function.

    Example 1: you’re watching a movie in a theater and you get call from grandma who is watching the kids. Little Johnny is having an allergic reaction and grandma doesn’t know where the medication is. She calls the cell phone and the user is given a message that a call is incoming. If the user steps into the hall the user can place a return call.

    Example 2: Grandma calls. The message goes to voice mail. Missed call notification are allowed to go to the phone. Mom can check voice mail and call back.

    Example 3: When the user enters the network, the user chooses to allow incoming calls from “home” by entering in the home number on the keypad. When the call comes in, the user is notified and connected once the user moves into the hall. The caller is played a message which indicates the user is currently in a church/theater and that the call will be placed once the user is in the hall way.

    Example 4: you lock your phone in a small mail box size container, in the hall. You take a special beeper with you. If your phone rings or vibrates then the pager notifies you.
  6. Hey wait I know a lot about these things, the above examples are not possible.

    We have amazingly qualified staff who have worked on a number of specialized cellular equipment for government use. These things are possible. To make them easy in the commercial space, the following limitations and analysis should be noted.

Examples 1-2 can be provided if we are authorized either by the FCC or the carriers to operate our equipment. No carrier cooperation is required.

Example 3 requires cooperation between the equipment at the theater and the phone provider. This can not be done independently with commercial equipment.

Example 4: Available and legal today. We could provide this to customers at this time. However, user satisfaction is low. This does not stop people from talking in the theaters unless special shielding is installed in the walls. This is the only legal way to address this problem. We would be happy to advise on the feasibility of this approach. We have found that this is a very expensive solution. This typically requires a remodel of your structure.