They were selling these online from shady resellers at least ten years ago. A friend picked one up and told me he could jam some phone calls on the train, depen

They were selling these online from shady resellers at least ten years ago. A friend picked one up and told me he could jam some phone calls on the train, depending on carrier and frequencies used I suppose. I think it broke a week or two later and he tossed it. Second link from google: http://www.jammerfromchina.com/categories/Mobile_Phone_Jammers/ http://www.jammerfromchina.com/categories/Mobile_Phone_Jamme...