T-Mobile IP Relay is a free internet-based telecommunications mobile app designed for individuals who are deaf, hard of hearing, deafblind, or have a speech disability. The app is available for Android-powered devices running Android 6.0 or higher, including tablets, and is also accessible on wireless networks. With IP Relay, users can make and receive relay calls and communicate using text. The app connects users with qualified relay operators and features an integrated contact list, call history, and access to live customer care.

It is important to note that the app is only available in the USA and US territories, and international calls will either be blocked or terminated. Registration is required to use the app, and if no data plan service is selected, casual data charges may apply. Users should also be aware that although IP Relay can be used for emergency calling, it may not function the same as traditional 911/E911 services. By using the IP Relay app for emergency calling, users agree that T-Mobile is not responsible for any damages resulting from errors, defects, malfunctions, interruptions, or failures in accessing or attempting to access emergency services through IP Relay, whether caused by the negligence of T-Mobile or otherwise.