Okla. Stat. tit. 74, § 3110

This act shall not apply to monthly billings submitted to the state or any county or local subdivision of the state for public utility companies, electric cooperatives or telephone companies, whose services are regulated by the Oklahoma Corporation Commission nor to said utility companies, electric cooperatives or telephone companies for billings pertaining to installations or changes in service, where tariffs for such charges or billings by said companies are on file with the Oklahoma Corporation Commission.