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Hearing Carry Over (HCO) TTYs

HCO is for hearing persons with varying degrees of speech loss who wish to listen directly to the person they call and respond by typing using a TTY. The HCO option is available on many TTYs. Free HCO service is available through the Telecommunications Relay System, and private relay services, and is an operator service that allows people with speech impairments to place calls to standard telephone users via TTY