Definitions for "Textphone"
A textphone can be used to receive and make phone calls. Textphones have a small display screen and keyboard so you can type what you want to say and read what is being typed in reply. Some textphones have a voice telephone handset and others can be used with a separate voice telephone. If you are severely or profoundly deaf you may want to use a textphone.
A telephone facility with electronic keyboard that enables Hearing Impaired people to communicate - communication can be direct textphone to textphone or via a Typetalk Operator (relay service) from an ordinary telephone to a textphone.
a device used by the deaf and/or hard-of-hearing in order to communicate over PSTN or IP networks