View all text of Chapter 87 A [§ 6151 - § 6155]
§ 6155. Prohibition of expiration date
(a) No automatic removal of numbers
(b) Removal of invalid, disconnected, and reassigned telephone numbers
(Pub. L. 108–10, § 5, as added Pub. L. 110–187, § 2, Feb. 15, 2008, 122 Stat. 633.)