Hearing-Impaired are able to communicate to a Police dispatcher 24 hours a day for Police Services using Internet Relay

Internet Relay Service is an online way to place text relay calls. It works over the Internet so that relay calls are possible without a TTY. Instead, relay users connect to a Communications Assistant through the Internet relay website, and communicate by typing outgoing messages on their computer keyboards and reading incoming messages on their computer monitors.

Because Internet Relay Service is an online service, it offers several advantages that TTY Relay cannot. Among these are the larger text display area, up-front call instructions to the Communications Assistant, adjustable text sizes and colors for easier reading, and split-screen mode to separate conversations.

using Sprint relay learn more 

   Sprint Internet Relay -  click here    

    AT&T internet relay -  click here