Were you aware that many call center calls were handled by prisoners?

So I am watching Law & Order, and part of the plot involves the fact that many call centers are using currently incarcerated prisoners to talk to customers who call companies with contracts with these prisons
I am wondering what companies use these call centers.
Would you think twice now about calling a call center?
Should these centers be required to identify themselves before you give them your credit card number or social security number?