47 CFR § 64.1506 - Number designation.
§ 64.1506 Number designation.
Any interstate service described in § 64.1501(a)(1)–(2), and not subject to the exclusions contained in § 64.1501(a)(4), shall be offered only through telephone numbers beginning with a 900 service access code.
[59 FR 46770, Sept. 12, 1994]