Zte Zmax User Manual page 69

Enable FDN: Input the PIN2 code to enable the FDN feature.
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Change PIN2: Change the PIN2 code for FDN access.
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FDN list: Manage the FDN list.
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NOTE: The PIN2 code is provided by your carrier. Entering an incorrect
PIN2 code more times than allowed can get your micro-SIM card locked.
Contact the service provider for assistance.
Set TTY Mode
Select a TTY mode for your phone to work with a teletypewriter, or turn
TTY off.
1. Touch the Home Key >
2. Touch TTY Off to turn the feature off, or touch TTY Full, TTY HCO,
or TTY VCO to select a mode for your phone to work with the
teletypewriter. Consult your teletypewriter manufacturer's manual if
necessary.
Set DTMF Tones
You can set the length of Dual-tone multi-frequency (DTMF) signal tones.
1. Touch the Home Key >
2. Touch Normal or Long.
> > Settings > TTY mode.
> > Settings > DTMF tones.
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