Zte WF721 User Manual page 16

order to use the TTY network, you must have a TTY-compatible
phone and be in 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
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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