Every owner or operator of coin-activated telephones available for public use, other than a telephone corporation, which, as part of the service furnished, provides operator-assisted services by other than a telephone corporation having tariff schedules on file with the commission providing for the furnishing of operator-assisted services shall cause to be posted on or near the telephone equipment so as to be easily seen by telephone customers all of the following information:
(a) The name of the provider of operator-assisted services and a toll-free telephone number for contacting that provider.
(b) The applicable charges for each available operator-assisted service.
(c) That the provider of operator-assisted services will respond to inquiries concerning the terms and conditions of any available service.