Continue the conversation, wherever you are. Real-Time Text (RTT) helps customers with disabilities communicate over the wireless network as an alternative to TTY (TeleTYpewriter). RTT uses a free-flowing mix of text and voice conversation, so as quickly as characters are typed on the sending device, they are displayed on the receiving device. RTT is a separate service from traditional text messaging (SMS). – Great for everyday communication – Supports 711 and 911 calls – Eliminates the need to connect to mobile TTY devices – Works on the cellular network and over Wi-Fi Calling – Offers a more natural, conversational flow compared to TTY and relay service for persons who are deaf, hard-of-hearing, or have speech disabilities – Supports simultaneous text and speech on RTT-to-RTT calls – Automatically imports contacts from your phone – Works on iPhone with iOS 9.0 and up; Data and voice rates may apply for app download & usage.