There are some places where it is hard to catch a signal in your cell phone you have to move around till you get all the bars. That usually happens due to the lack of boosters. Boosters ensure that you catch signals in radio controlled devices. However, there are times when these signals or boosters are completely blocked out. This happens because of signal jammers or bomb jammers. Both are almost the same but have one main difference.
If you want to differentiate between bomb jammers from the signal jammer then you should read this article as it contains all the information that you are looking for. You can think of this article as your ultimate guide to bomb jammers.
It is a no brainer to figure out what a bomb jammer does, it is exactly what it sounds like. Any bombs that may be controlled through radio frequencies are jammed through this device. Not only that bomb jammers also block signals from devices like cell phones and satellite phones. But signal jammers are not able to block all explosive devices. Although there are some models that may be able to do so.
It is not that hard to obtain a bomb jammer and many security and intelligence agencies use it for security purpose. It can very easily be purchased online, however, make sure that its use is legal where you live before you end up using it. In the US, the use of both bomb jammers and signal jammers is strictly banned so if you do not want to get in trouble, you should not be using it so casually. Make sure you get official permit before using one so that you do not have to face any issues.