Calls to 911 from a TTY will not work when using WiFi Calling or Voice over LTE (VoLTE). If you are deaf or hard of hearing and need assistance in communicating over the telephone, T-Mobile recommends that you use an internet-based Telecommunications Relay Service such as Video Relay Service, IP Relay Service, or IP Captioned Telephone Service, including for calls to 911. T-Mobile’s HSPA+ and LTE data services can support these relay services. In addition, as of December 31, 2017, T-Mobile Real-Time Text (RTT) technology is available on T-Mobile’s network and can be used on select devices to contact 911. For more information, see www.t-mobile.com/accessibilitypolicy
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