Why Corrections have got it all wrong jamming cellphones.

By Steve Biddle, in , posted: 23-Aug-2007 10:52

So corrections want to install cellphone jammers in prisons to stop prisoners making calls? This is an issue I spent some time discussing yesterday afternoon with a friend who had done some brief work on cellphone jamming in NZ a while back when corrections first proposed installing equipment into prisons. The technology can work in some circumstances but can also prove unreliable. What it doesn't deal with however is the issue of blocking WiFi signals. With the number of cellphones now with VoIP and WiFi capabilities the move by corrections to install cellphone jamming equipment is going to about as effective as giving somebody a two roadcones to block a road. It will stop some people but anybody who has a brain (ie many prisoners) will realise an exploit to get around the system is dead easy.

Firstly smuggle your WiFi/VoIP capable Nokia phone or Netgear Skype phone into a prison (very easy). Next your mate parks outside with a WiFi AP hooked up to a cellphone (again very easy) and before you know it you're connected to the real world again. Simple isn't it. I wonder why not a single person at corrections was aware of such an exploit? They're going to waste $5 million of taxpayers money on a system that will have exploits from day one.

It reminds me of their stupid system about 10 years ago were prisoners were only able to dial fixed nominated numbers from the prison payphones. They would nominate friend X on number 1234567 and were free to call them. Corrections spent a lot of money implimenting this rock solid system to discover that some smart people realised if you rang your nominated mate he could put his phone on divert to another number and talk to anybody they wanted.

Bruce over at Aarkvark has also posted about the issue of cellphones in prison and has a few comments  in regards to it.

Other related posts:
No, AT aren’t stealing your money. How Stuff confused a nation.
The perils of using Airbnb during big events
How to remotely control your heat pump from your phone for under NZ$25






comments powered by Disqus

sbiddle's profile

Steve Biddle
Wellington
New Zealand


I'm an engineer who loves building solutions to solve problems.


I also love sharing my views and analysis of the tech world on this blog, along with the odd story about aviation and the travel industry.

My interests and skillset include:

*VoIP (Voice over IP). I work with various brands of hardware and PBX's on a daily basis
  -Asterisk (incl PiaF, FreePBX, Elastix)
  -Polycom
  -Cisco
  -Linksys
  -Patton
  -Zyxel
  -Snom
  -Sangoma
  -Audiocodes

*Telecommunications/Broadband
  -xDSL deployments
  -WiMAX
  -GSM/WCDMA
  -WiFi

*Structured cabling
  -Home/office cabling
  -Phone & Data

*Computer networking
  -Mikrotik hardware
  -WAN/LAN solutions

*Wireless solutions
  -Motel/Hotel hotspot deployments
  -Outdoor wireless deployments, both small and large scale
  -Temporary wireless deployments
   
*CCTV solutions
  -Analogue and IP

I'm an #avgeek who loves to travel the world (preferably in seat 1A) and stay in nice hotels.


+My views do no represent my employer. I'm sure they'll be happy to give their own if you ask them.


You can contact me here or by email at stevenbiddle@gmail.com

twitter.com/stevebiddle