Samsung GALAXY S8 User Manual page 149

If this cable was not provided with your TTY device,
contact your TTY device manufacturer to purchase the
connector cable.
To turn TTY Mode on or off:
1. From home, tap
Settings.
2. Tap More settings > TTY mode.
3. Tap TTY Full, TTY HCO, or TTY VCO to turn
TTY mode on.
– or –
Tap TTY Off to turn TTY mode off.
Note: When enabled, TTY mode may impair the
audio quality of non-TTY devices connected to the
headset jack.
Apps
Phone > More options >
Warning: 9-1-1 Emergency Calling
It is recommended that TTY users make emergency
calls by other means, including Telecommunications
Relay Services (TRS), analog cellular, and landline
communications. Wireless TTY calls to 9-1-1 may be
corrupted when received by public safety answering
points (PSAPs), rendering some communications
unintelligible. The problem encountered appears
related to TTY equipment or software used by PSAPs.
This matter has been brought to the attention of
the FCC, and the wireless industry and the PSAP
community are currently working to resolve this.
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