According to investigative journalist, Alix M. Freedman, "A single prison phone can gross $15,000 per year, five times more than a street phone box."
Ngokusho intatheli okuphenya, Alix M. Freedman, "A ejele phone olulodwa kungaba inzuzo $ 15,000 ngonyaka, kahlanu ngaphezu ibhokisi phone emgwaqweni."