Comment $100 fix (Score 1) 428
Just install a cell phone blocker. Problem solved. I'm sure the prison system can arrange an FCC exemption to use this.
http://www.dealextreme.com/p/cell-phone-signal-blocker-40m-range-mountable-7709
I have yet to see any problem, however complicated, which, when you looked at it in the right way, did not become still more complicated. -- Poul Anderson