47 C.F.R. § 68.224

Every non-hearing aid compatible telephone offered for sale to the public on or after August 17, 1989, whether previously-registered, newly registered or refurbished shall:

(a) Contain in a conspicuous location on the surface of its packaging a statement that the telephone is not hearing aid compatible, as is defined in §§ 68.4(a)(3) and 68.316, or if offered for sale without a surrounding package, shall be affixed with a written statement that the telephone is not hearing aid-compatible, as defined in §§ 68.4(a)(3) and 68.316; and

(b) Be accompanied by instructions in accordance with § 68.218(b)(2).