When you have concerns about the annoying signals that interrupt you so much when you are in public areas, or when you need a quiet condition, or if you care about your privacy so much, or if you have such concerns about your own thought about get a soft life. Or when you don't want others using cell phone or any devices that bother you so much, then you can come to have a look at this 3g signal detector  from Jammerinthebox, you will appreciate it.