Mo. Rev. Stat. § 221.108: Phone services, reasonable access — limit on charges to inmates.

1. Jails shall provide inmates with reasonable access to phone services during an inmate's term of confinement, except phone access may be restricted as a disciplinary measure.

2. No jail or other party shall charge an inmate in a jail a total amount for a domestic phone call, including fees and any per-minute rate, that exceeds the equivalent of twelve cents per minute.