29 Commission said, “Section 202 . . . does not prevent carriers from treating users differently; it bars only unjust or unreasonable discrimination. Carriers may differentiate among users so long as there is a valid reason for doing so.” Id. at 16730-31(emphasis in original)). It reasoned that, “in emergency situations, non-[emergency] customers simply are not ‘similarly situated’ with [emergency] personnel” because “the ability of [the latter] to communicate without delays during emergencies is essential.” Id. at 16731. Even when the Commission engages in full-scale rate regulation (which it purports to eschew in the Order), it explicitly recognizes that reasonable price differentials are appropriate where the services in question are unlike. See, e.g., In re AT&T Communications Revisions to Tariff F.C.C. No. 12, 6 F.C.C. Rcd. 7039 ¶ 8 (1991). Tellingly, in its prioritized emergency mobile services decision the Commission did not see fit to discuss § 201 at all. The principle underlying the Commission’s understanding of § 202 was a broad one—that allowance of differential rates based on “valid reasons” advances the public interest. Whatever explains the lack of any reference to § 201, the Commission’s recognition that differential rates were not inherently unjust or unreasonable under § 202 requires, as a minimum of coherent reasoning, that it offer some explanation why the same words in § 201 should preclude such differentials. See Orloff v. Vodafone AirTouch Licenses LLC d/b/a Verizon Wireless, 17 F.C.C. Rcd. 8987, 8999 (finding reasonableness and justness under § 202 to be sufficient for finding the same under § 201). Of course this is no more than a recognition of the principle, prevailing throughout the era of federal regulation of natural monopolies, that it is just and reasonable that customers receiving extra speed or reliability should pay extra for it. A classic and pervasive example is the differential in natural gas transmission between firm and interruptible service. See, e.g., Fort Pierce Utilities Auth. of