Are all telephones sold in the U.S. required to be hearing aid compatible?
Yes. As of August 16, 1989, all telephones manufactured or imported for use in the U.S. have been required to be hearing aid compatible. Cordless telephones manufactured or imported for use in the U.S. have also been required to be hearing aid compatible since August 16, 1991. Secure telephones are exempt, as are telephones used with public mobile services or private radio services.
