47 C.F.R. § 64.1509
(a) Any common carrier assigning a telephone number to a provider of interstate pay-per-call services shall make readily available, at no charge, to Federal and State agencies and all other interested persons:
(b) Any common carrier assigning a telephone number to a provider of interstate pay-per-call services and offering billing and collection services to such provider shall:
(2) Provide to all its telephone subscribers, either directly or through contract with any local exchange carrier providing billing and collection services to that carrier, a disclosure statement setting forth all rights and obligations of the subscriber and the carrier with respect to the use and payment of pay-per-call services. Such statement must include the prohibition against disconnection of basic communications services for failure to pay pay-per-call charges established by § 64.1507, the right of a subscriber to obtain blocking in accordance with § 64.1508, the right of a subscriber not to be billed for pay-per-call services not offered in compliance with federal laws and regulations established by § 64.1510(a)(1), and the possibility that a subscriber's access to 900 services may be involuntarily blocked pursuant to § 64.1512 for failure to pay legitimate pay-per-call charges. Disclosure statements must be forwarded to:
[58 FR 44773, Aug. 25, 1993, as amended at 61 FR 55582, Oct. 28, 1996]