Prison phone calls are one of the most important lifelines between an incarcerated person and their family, and one of the most expensive. The prison phone industry has historically operated as a near-monopoly charging rates that few other consumer services would get away with. This section covers how the prison phone system works, why rates are so high and what has changed in recent years, how debit calling accounts function, how to get a number approved on an inmate's call list, how InmateAid's local number service reduces call costs by up to 70 percent, and what international callers need to know about reaching a US facility from another country. The questions answered here come from families who are paying too much for calls and from inmates trying to navigate phone access from inside. Understanding how the system works is the first step toward getting the most contact for the least cost. See also our sections on Money Transfer and Commissary.