A person who is deaf or hard of hearing may benefit by using a text telephone, also known as a TTY, to type his or her conversation. The operator then relays the other person's spoken words by typing them to the TTY user. http://relaysd.com/
Watch video RelaySD: Making and receiving a TTY call online without registration, duration hours minute second in high quality. This video was added by user South Dakota Department of Human Services 14 August 2015, don't forget to share it with your friends and acquaintances, it has been viewed on our site 29,292 once and liked it 122 people.