Contents Applicability § 42.01 Applicability. General Instructions § 42.1 Scope of the regulations in this part. § 42.2 Designation of a supervisory official. § 42.3 Protection and storage of records. § 42.6 Retention of telephone toll records. Specific Instructions for Carriers Offering Interexchange Services § 42.10 Public availability of information concerning interexchange services. § 42.11 Retention of information concerning detariffed interexchange services.