They probably also do the dance of finding numbers that are unblocked. Prisons sometimes get kickbacks or have other corruption to limit inmates access to phone

They probably also do the dance of finding numbers that are unblocked. Prisons sometimes get kickbacks or have other corruption to limit inmates access to phone services. It's often quite a bit of work for us to get numbers in the exact area needed for a particular prison. It's certainly not always as easy as picking out a random VoIP provider and picking a rate center.