Real-Time Text (RTT) calling represents a feature on Android phones that allows individuals to transmit text messages during a phone call. Unlike traditional voice calls, this functionality provides immediate text communication, where characters appear on the recipient’s screen as they are typed. This is different from SMS or other messaging services, as the text is sent and received during the live call connection. As an example, someone could use this feature to clarify a spoken address or share a specific code while simultaneously speaking with the call recipient.
The significance of this capability lies in its accessibility benefits, primarily for individuals who are deaf, hard of hearing, or have speech impairments. It enables them to engage in phone conversations with greater ease and independence. Functionality of RTT improves the usability of smartphones in scenarios where voice communication may be challenging or impossible. Historically, teletypewriters (TTY) were used for similar communication, but RTT provides a more modern and integrated solution within the mobile phone itself. This evolution reduces the need for specialized equipment and enhances the overall user experience.