S e t t i n g s a n d T o o l s78with parties also using a TTY device, select Menu > Settings & Tools > Call Settings>TTY Mode and one of the following:TTY Full — turn on full TTY capability.TTY + Talk — turn on TTY in voice carry-over (VCO) mode.TTY + Hear — turn on TTY in hearing carry-over (HCO) mode.TTY Off — turn off TTY mode.One-touch dialTo initiate a speed dial call by entering the speed dial digits, select Menu > Settings& Tools > Call Settings > One Touch Dial > On or Off. If set to Off, speed dialnumbers designated in your contact list do not function. See "Speed dials", p. 59.Voice privacyTo set the voice privacy feature for CDMA calls, select Menu > Settings & Tools >Call Settings > Voice Privacy > Enable or Disable. The voice privacy feature protectsthe privacy of your current phone conversation from other callers placing phonecalls on the same network. CDMA offers inherent voice privacy that protects theidentity of users and makes interception very difficult. This is a network service.DTMF tonesDual Tone Multi-Frequency (DTMF) tones or touch tones are the tones that soundwhen you press the keys on your phone keypad. You can use touch tones for manyautomated dial-up services such as banking and airlines or for entering your voicemailbox number and password. To set the key tone length, select Menu > Settings& Tools > Phone Settings > Call Settings >DTMF Tones. Select Normal to send out a