HTC DROID Eris PB00100 - Manual (Page 65)

Using Phone Features 65
2.5 Adjusting Phone Settings
You can adjust the phone settings of your phone such as your voice
mail number, Plus code dialing, Voice privacy, and more.
To open the phone settings menu, press HOME
> MENU, and then tap
Settings > Call settings.
Options Description
Voicemail Specify the voice mail number.
Clear voicemail
notification If you have a notification of a new voicemail, you can
clear the notification with this option.
Enable TTY
support Enable TTY (Teletypewriter) support for your device.
Voice privacy Select to add another layer of encryption for outgoing
voice calls and to use secure channels when available.
Voice privacy
notification Select to alert you if voice privacy is not available.