Well, first of all, we should mention that as long as a signal jammer device is created, it will be tested. In addition to all necessary tests for battery life, transmission frequency, etc., the shielding distance is also tested. Manufacturers always claim that they are larger than they really are because these devices are often tested in open spaces. As you know, the range is greater when there are no buildings and different concrete structures. Most of us live in big cities, surrounded by tall buildings. Therefore, you should not be surprised if your homemade cellphone blocker cannot stop cellphone signals 30 meters away. There may be many reasons, but the most reasonable reason is the dense surrounding buildings.
If you don't know how to operate this type of device, don't worry too much because it is easy to do. All you need to do is press the start button. Keep in mind that most of these portable jammer devices have different battery life, so you should check how long they can work. Of course, you should make sure that no one detects that you own these devices, because once discovered, people start to realize that they do have an jammer device that interferes with signals from remote controls everywhere. Make sure you get the best equipment on the market! You should also clear your mind and determine your budget, as it is important to know that there are several models of products ranging from a few hundred dollars to several thousand dollars.
The good news is that jamming technology is constantly evolving, which is why it will be more and more. Some of the best blocking programs can block radio signals from a few kilometers or more. Considering that this was not possible a few years ago, this achievement is indeed significant.