It is common sometimes to be in place wherein your cell phone signal may not be working and even your Bluetooth devices. seeing that your Wi-Fi is also not working is what you can also realize when you are in these places. The moment that you will be experiencing these things, then it might be an area where signal jammers are put in place. It is your call that will be blocked the very moment that these signal jammers are in pace .
The initial purpose of these devices is to make sure that no one can be able to receive calls especially in public places where silence is needed like the theater and the library. Making distractive noises with their phone is what some people will be doing especially when they are in these places disrupting other people. It is the phone jammer that will be able t prevent this in from happening and that is why they are installed in these places. When you are talking about phone blocker , then you will see them often in theatres, religious places like churches, like hospitals, libraries, museum etc. People with criminal minds soon made use of these devices to be used in their criminal acts. For most homeowners, they will not be able to make any call to the authorities whenever there is a robbery since the robbers will use them to block signals.
There are many countries nowadays that are now banning these devices due to these reasons. Many emergency calls have also been disrupted due to the interference that it is making. But you can still see some countries that allow signal jammers to be used but in public area. Asking permission from the authority is what you also should need to do so that you will have permission to use them. It is in jail and banks that signal jammers are legal to be used. The moment that these signal jammers are used in these places that basically bank robberies are prevented. It is when there are military operations that signal jammers are also being widely used. But regardless of the purposes, it is very important that these devices will be used with care. Any unwanted interference will be prevented the very moment that you will be doing this one. It is this precaution that is very valuable to see to it that any emergency calls will still make it through.
It is these devices that you can still purchase online despite the ban that has been imposed on them. At a very god deal, you will be able to see some of them online. Most of the signal jammers that you will see online are the ones that also looks like a cell phone. A fully charged signal jammer is what you will need before you can use them. Blocking certain frequency is also what some signal jammers can do since they have a frequency filter.