Compared to other kinds of cell phone jammers, a portable cell phone jammer can be carried unnoticeably to everywhere. You can use it to keep your own secret when making a private phone call. Or you can apply this without being aware of by others when holding a company meeting discussing something confidential. Or in another occasion, if you are a famous person like a pop star who doesn’t want to be sneakily followed and recorded, a portable cell phone jammer would surely be of great help.The portable cell phone Jammer is compact yet powerful. The blocking radius of a portable one is no narrower than those bigger ones. Its working range can cover from 10 meters to about 30 meters.