What are TDD, TTY, and text phones?

TDD (Telecommunication Device for the Deaf), TTY (Teletypewriter), and text phones are all devices specifically designed to assist individuals who are speech- and/or hearing-impaired in communicating over the telephone. These devices convert typed messages into spoken words and vice versa, allowing users to communicate effectively with others via a telephone network.

Using these devices, users can type out their messages, which are then transmitted over the phone lines. On the receiving end, the other person can either read the typed message on a screen or hear it if the TTY is connected to a phone capable of voice output. This technology plays a crucial role in ensuring that individuals with hearing impairments have equal access to emergency services and can communicate their needs effectively, especially in urgent situations like calling 9-1-1.

The other options do not accurately describe TDD, TTY, and text phones. They relate to different aspects of telecommunication or emergency services that do not pertain to devices designed for the deaf or hard of hearing.