Real-time texting or RTT is a way for two people to instantly communicate through a personal computer or a mobile phone. When using RTT, the screen shows two conversation boxes, one for each user. As one person types a message, the other sees the words forming, letter by letter. The other person can respond, interrupt, or ask questions at the very same time.
The technology behind real-time text is similar to that used for Internet-based telephone systems like Skype. But getting the service is an uphill battle for users who could greatly benefit from it. There’s little financial incentive for telecommunications companies to serve the niche market of those with hearing loss.