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by Diane Dannenfeldt

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  • 2
    How Telephone Amplifiers Work
  • 3
    TTY and TDD Technology
  • 4
    How Relay Services Work
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    Lots More Information
  • Lots More Information

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    Please copy/paste the following text to properly cite this HowStuffWorks article:

    Dannenfeldt, Diane.  "How Hearing Impaired Telephones Work"  13 June 2008.  HowStuffWorks.com. <http://electronics.howstuffworks.com/hearing-impaired-telephones.htm>  16 May 2012.
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    Introduction to How Hearing-Impaired Telephones Work
  • 2
    How Telephone Amplifiers Work
  • 3
    TTY and TDD Technology
  • 4
    How Relay Services Work
  • 5
    Lots More Information
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