Rhode & Schwarz's Telephone Encryption SystemThe TopSec Mobile is a voice encryption device that can be connected to almost any commercially available mobile phone using a Bluetooth® interface. It provides confidential, tap-proof communications anywhere in the world.
The encryption has been embedded in the TopSec Mobile hardware to avoid the susceptibility of GSM phones to manipulation.
The TopSec Mobile is plug-and-play, compatible with most commercially available mobile phones, interoperable with other TopSec products in analog and digital fixed networks, as well as in mobile radio networks. (more)
Very cool concept. Easy to use with existing phones.
So... if what you have to say is so important, why aren't you using these?
