The Dark Future of Phone Jamming

[n2doc]

Phone jamming is about to get political. Everyone from police to governments are using simple devices that prevent people from making calls or texting in certain areas — and they're doing it to control the flow of information. Let's take a look at these devices, their legality and current uses. Then we'll look at how this technology will be used against you in the future.

The simple science behind blocking your phone calls

Cell phone jammers work by transmitting radio waves on the same frequency used by your digital cell phone. By emitting such a signal, communications between your phone and a cellular communications tower is disrupted.

In the United States and South America, most digital mobile phones operate on a a 1.9 GHz frequency band, while 900 Mhz and 1.8 GHz bands are used across most of Europe and Asia. Even if your phone operates on multiple bands, manipulation of a single band is enough to cause a call to fail by disturbing the outgoing call or incoming voice data.
more

http://io9.com/5899130/the-dark-future-of-phone-jamming

[leveymg]

1. Cell phone ECM device stats, including range of operation, here:

http://www.qccglobal.com/products/ecm605-gsmumts-23g-electronic-countermeasures-unit/