A major advance in communication technology for people with a hearing loss is the telecommunication device(TDD) . In 1990, the Americans with disabilities act renamed these devices text telephone (ITs). TTs send receive and print message through thousands of station across the United States people with a hearing loss can now dial an 800 number to set up conference calls. Make appointments or order merchandise or fast food. Anyone who wants to speak with a person using a TT can do so through the use of a standard telephone