64ASSISTANCEAssistanceAssistive Communication DevicesTTY (Text Telephony) and TDD (TelecommunicationsDevice for the Deaf) allow individuals who are deaf, hardof hearing, or have speech or language disabilities tocommunicate by telephone.When a user types his or her conversation on a TTYkeyboard, it is transmitted as tones through thetelephone. Tones are received by the other person’sTTY, translated into text and displayed on the screen.In order to use the TTY network, you must have a TTY-compatible phone and be in the TTY mode to place orreceive calls. Note that most digital wireless devices areTTY-compatible.
