How to use Real-time text (RTT) on iPhone
Did you know you can use the Real-time text (RTT) protocol for conversational text calls on the iPhone? In the United States, you can make and receive RTT calls on the iPhone 6 and later. With RTT, you can transmit conversational text as soon as you — or the person you are talking to — type it out. The newest technologies that make this possible include instant messaging, Text-over-IP, and IP-relay. Here's how to use RTT on your iPhone.
How to set up RTT on iPhone
To use RTT on your iPhone, you must have a compatible…