Real-Time Text (RTT) calling, a feature available on Android devices, allows users to transmit text during a phone call. This functionality provides accessibility for individuals who are deaf, hard of hearing, or have speech impairments. Disabling this feature prevents text from being sent or received during calls, reverting to voice communication only unless accessibility services are intentionally utilized.
Disabling RTT calling can be beneficial in situations where voice communication is preferred, or when data usage is a concern. It can also streamline the call experience if the user does not require or actively utilize the text-based communication option. Historically, teletypewriter (TTY) devices served a similar purpose, but RTT offers a more modern and integrated solution within the mobile phone’s interface.