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TTY definition

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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