47 C.F.R. § 64.1507
Prohibition on disconnection or interruption of service for failure to remit pay-per-call and similar service charges
No common carrier shall disconnect or interrupt in any manner, or order the disconnection or interruption of, a telephone subscriber's local exchange or long distance telephone service as a result of that subscriber's failure to pay:
(a) Charges for interstate pay-per-call service;
(b) Charges for interstate information services provided pursuant to a presubscription or comparable arrangement; or
(c) Charges for interstate information services provided on a collect basis which have been disputed by the subscriber.