72 Phone calls
If you have a notification of a new voicemail, you can clear the 
notification with this option.
TTY mode
Allow the use of a TTY (teletypewriter) device for users who are 
visually or hearing impaired.
Hearing aids
Turn on the Hearing Aid Compliance feature that reduces interference 
to hearing aids.
Phone settings
Edit the call reject message, choose whether to open the message 
editor when you reject a call with a message, and choose whether to 
allow automatic saving of an unknown contact number when a call 
with that number ends.
Voice Privacy
Encrypts outgoing voice calls and uses secure channels when 
available.