This is literally companies causing harm (and not just economic) harm to societies citizens at large. I respect jlafon's point of view but I can't agree. The fact that a system you create is difficult to adminster should not mean that the cost of dealing with it should be passed along to your 'customers' (gagging as I use that word). When a group of people chooses to put others in a position of limited power they have a responsibility to protect them from harm. Treating prisoners as a revenue stream at all is immoral and I believe unconstitutional. The argument that they should pay or do anything to contribute to their imprisonment is vapid and ugly. If we aren't willing to shoulder the burden of imprisoning them then we shouldn't do it. We absolutely should not be charging them or their families usury amounts of money to satisfy rules and situations we created.
Letting prisoners use the phone is labor intensive? Why? because you created rules and a system where it is. To spin it as more complicated or containing 'reasons' is post hoc justification nonsense and should be treated as such.
[1] Summarized here: https://www.prisonlegalnews.org/news/2014/apr/15/lowering-re...