Real-time text (RTT) is a feature that can make it easier for customers with hearing or speech impairments to carry on a conversation through text.
With standard text messaging or, you have to compose an entire message, hit Send and then wait for a reply. But with real-time text, each character is transmitted immediately as it’s typed. So it’s as if you’re having a conversation “in real time.” Since there’s no delay between sending and receiving messages, and because you can talk and text simultaneously over the same connection, RTT can feel like a more natural form of communication than TTY or text messaging.
Unlike TTY, there’s no need for a separate device. As long as your Verizon Wireless phone supports RTT, you can send and receive real-time text using only your smartphone. (Note: If the person you’re calling does not have RTT or TTY enabled on their device, the call will be voice only.)