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TBH, the military possess electronic warfare technology that can inhibit mobile phone signals (i.e. to stop bomb detonation), it's not going to be hard to get something along the same lines for prisons. I have no doubt that a government department will have plenty of co-operation from phone companies in how to block their signals.
Failing that, you can brute force deny the operation with transmitters. If your only trying to deny access to a small area, it's not overly hard.
To everyone saying they should beef up security, don't you think they've already tried that? I can understand the toleration of illicit phones to non-dangerous or rehabilitating prisoners, but the kind of people that this article is aimed about are end of the line convicts. An answer for non-risk prisoners might be to supply mobile phones with a pre-programmed set of numbers that they receive for good behaviour, which can be externally monitored. I also suspect that new high tech prisons will employ some sort of faraday cage design to prevent this in the future.
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