What is TTY in texting?

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Tags

1. #telephone
2. #device
3. #talking
4. #allowing
5. #speech
6. #telecommunication
7. #communicate
8. #hearing
9. #listening
10. #another
11. #forth
12. #special
13. #messages
14. #people
15. #called
16. #impaired
17. #instead
18. #sometimes