US lawFederal (United States)RegulationsTitle 47 CFR — TelecommunicationChapter IPart 51Subpart C51.20347 C.F.R. § 51.203Number portability.Last amended: 2017Year: 2026Length: 16 wordsOfficial source Cite as 47 C.F.R. § 51.203 (2026)The rules governing number portability are set forth in part 52, subpart C of this chapter.Previous47 C.F.R. § 51.201Next47 C.F.R. § 51.205