[panarky]

Cell phones and other contraband may be prohibited, but they still exist in prisons.

  State prison records show that for the first seven months of
  this year, corrections officers have seized 319 cell phones
  from inmates [in Ohio's] 28 prisons.

http://www.cleveland.com/metro/index.ssf/2013/08/ohio_prison...

[mistercow]

I'm sort of surprised that, rather than seizing them, they don't just put an IMSI catcher there and listen in on inmates' illicit calls.