• Adventure
  • Auto
  • Culture
  • Entertainment
  • Home & Garden
  • Money
  • Science
  • Tech
  • Video
  • Shows
  • Blogs
  • Quizzes
  • Games
  • Random Article
  • Computer
  • Electronics
  • Home / 
  • Tech / 
  • Electronics / 
  • Phones / 
  • Telephone Technology

by Diane Dannenfeldt

MORE STUFF LIKE THIS:

How It's Made: Neon Signs
How It's Made: Neon Signs
TV Evolution Pictures
TV Evolution Pictures
Tech Talk: RAM Quiz
Tech Talk: RAM Quiz
10 Sci-fi Gadgets We Wish Actually Existed
10 Sci-fi Gadgets We Wish Actually Existed
  • Page
  • 2
    How Telephone Amplifiers Work
  • 3
    TTY and TDD Technology
  • 4
    How Relay Services Work
  • 5
    Lots More Information

    • Lots More Information

    Related HowStuffWorks Articles

    • How Weather Alerts Work
    • How SMS Works
    • How Smartphones Work
    • How VoIP Works
    • How Campus Alerts Work

    More Great Links

    • Gallaudet University Technology Access Program
    • The Better Hearing Institute
    • The Federal Communications Commission
    Print
    Cite This!
    Close 
    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.
    Cite
    Feedback
  • Page
  • 1
    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

    • Popular Tech Topics

    The Ultimate Computer History Quiz
    The Ultimate Computer History Quiz
    Top 5 Myths About the Internet
    Top 5 Myths About the Internet
    How to Connect Your Computer to Your TV
    How to Connect Your Computer to Your TV
    How Capacitors Work
    How Capacitors Work
    How Cloud Computing Works
    How Cloud Computing Works
    Take a look at Computer Videos

    You Might Also Like

    How Near Field Communication Works

    Fed up with carrying a wallet full of cards and a full ring of keys? Before long, you might be able to keep all of that stuff in your phone. How is it possible, and is your information safe in your phone?

    How Two-line Phones Work

    When was the last time you called someone besides your parents and got a busy signal? Two-line phones and other telecom technology are making that annoying signal disappear.

    Popular Articles

    • How the Google Phone Works
    • How do digital answering machines work?
    • Is there a combination tablet PC-phone on the market?
    • MOST WATCHED
    • MOST READ

    • MOST WATCHED

      • Want to win a free Apple iPad? Upload your best pics!
      • Ultimate Computer Hardware
      • How It's Made
      • Cell Phone Tricks
      • Stuff to Blow Your Kid's Mind

    • MOST READ

      • How to Detect if Someone's Stealing Your WiFi
      • How to See Who Views Your Facebook Profile
      • 10 Myths About Video Games
      • Top 10 iPhone Apps for Your Car
      • How Stun Guns Work

    Don't Miss

    The Greatest Inventor of All Time
    The Greatest Inventor of All Time
    The most mind-blowing pic wins an iPad!
    The most mind-blowing pic wins an iPad!
    Graphic Info: Plane Crashes
    Graphic Info: Plane Crashes

    CHECK OUT OUR PODCASTS

    STUFF NATION NEWSLETTER THE HOW BEHIND TODAY'S NEWS
    HOWSTUFFWORKS
    • Adventure
    • Auto
    • Culture
    • Entertainment
    • Health
    • Home & Garden
    • Lifestyle
    • Money
    • Science
    • Tech
    MORE STUFF
    • Blogs
    • Games
    • HSW Tools
    • RSS
    • Maps
    • Podcasts
    • Quizzes
    • Newsletters
    • Video
    OUR WEBSITES
    • Animal Planet
    • Consumer Guide Auto
    • Consumer Guide Products
    • Discovery Channel
    • Discovery Fit & Health
    • HSW Brazil
    • HSW China HowStuffWorks China
    • Investigation Discovery
    • Oprah Winfrey Network
    • Planet Green
    • Science Channel
    • TLC
    • Discovery Education
    • Store
    CUSTOMER SERVICE
    • Advertising
    • Contact Us
    • Help
    CORPORATE
    • About Us
    • Careers @ Discovery
    • Privacy Policy
    • Visitor Agreement
    TAKE US WITH YOU
    FOLLOW US
    © 1998-2012 HowStuffWorks, Inc