According to Edward Snowden, your privacy is totally violated by government agencies and we're living in a surveilance state. We've been selling these cases for a couple years and for the past couple months they've been selling like crazy. i think the idea that we're be surveilled has penetrated the public's consciousness.

It has what's called a Farady cage which blocks all radio wave from leaving the case. It can also protect your body from dangerous RF emissions. They come in 2 sizes for flip phones and Android and IPhones and they are very reasonably priced... as low as 14.00 each when you get 2 of the Iphone size.