HCO allows speech challenged users that can hear the ability to listen to the person they are calling.  The HCO user types his or her conversation for the Call Assistant (CA) to read to the standard telephone user.

Also dial 1-800-346-4128  if unable to reach 7-1-1 directly.       

Hearing Carry Over (HCO) phones require analog phone service.

A diagram depicting the call flow between the Hearing Carry Over user, Relay Operator and Voice User.