They're in prison ferchrissakes. They shouldn't be charged for anything, let alone charged extortionate prices for a phone call. If they don't want them making calls all the time, they should just give them a weekly or monthly time limit.

Link

When Mary Shields was first sent to prison, her daughter was too young to understand why their phone calls would cut off mid-conversation and why she would not hear from her mother again for days. Shields was among the many incarcerated people who had their contact with loved ones curtailed by the high rates for making prison phone calls. During her 21 years in a California state prison, she spoke with her family for 15 minutes twice a month. Each call cost $15.

And that's on top of the fact that private prisons use the inmates as slave labor. WTF?