T-Mobile customers with RTT-enabled devices will be able to send and receive RTT calls with other T-Mobile customers who have RTT-enabled devices. This functionality is available when the underlying network is 4G LTE (VoLTE) capable or Wi-Fi calling has been enabled. RTT will not function in the 2G/3G network. As inter-carrier RTT networks becomes operational, T-Mobile subscribers will also be able to send and receive RTT calls with subscribers of other carriers that support RTT functionality.
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