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TTY Support
TTY (Text Telephony) and TDD (Telecommunications Device for the
Deaf) allow the people who are deaf or have language barrier. When a
user types his or her conversation on a TTY keyboard, it is transmitted
as tones through the telephone. Tones are received by the other
person’s TTY, translated into text and displayed on the screen. In order
to use the TTY network, you must have a TTY-compatible phone and
be in the TTY mode. Note that most digital wireless devices are TTY-
compatible
Dial *983*889*n# to set the TTY mode.
n=0: TTY off mode. The standard voice speaking mode and the
listening mode. This is the default setting.
n=1: TTY full mode. Transmit and receive the TTY characters.
n=2: VCO mode. Receive TTY characters but transmit by
speaking into the speaker.
n=3: HCO mode. Transmit TTY characters but receive by
listening to the receiver.
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