Just turn off the electricity to any area that prisoners are allowed to be. In a day or two, all the cell phones will be dead.
Why do they need electricity anyway? It’s prison. It’s supposed to be a place that is brutal and cruel.
I don’t care how hot or cold they get. They don’t need lights at night.
Prison should be a dank dismal place without comforts of any kind.
Just turn off the electricity to any area that prisoners are allowed to be. In a day or two, all the cell phones will be dead.So ... additional BATTERIES are smuggled in ....
Besides, it would take MORE than just a 'day or two' to be effective ... do you/have you operated one of today's little technical marvels?