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Text Telephone / Teletype Terminal / TeleTYpewriter
Telecommunication Device for the Deaf
A TTY is a special device that lets people who are deaf, hard of hearing, or speech-impaired use the telephone to communicate, by allowing them to type text messages. A TTY is required at both ends of the conversation in order to communicate.
Like a traditional modem for land-lines, a traditional TTY will only work on analog mobile phone networks, not digital. Therefore a special digital TTY mode must be used with digital mobile phones. |
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