Okla. Stat. tit. 17 § 139.1
The Corporation Commission shall, by rule or order, promulgate and enforce operating requirements for coin-activated and credit card-activated telephones available for public use owned or operated by corporations or persons other than telephone corporations authorized by the Commission to operate within service areas. These requirements shall include, but are not limited to a requirement that every telephone permit a caller to be connected with the operator personnel of any telephone corporation authorized by the Commission to operate within a service area through the Commission authorized access method chosen by the operator service provider with exception of those coin operated or credit card-activated telephones made available to inmates at state, federal, local and county jails and correctional facilities.
Okla. Stat. tit. 17, § 139.1