Palm Treo 700p User Manual page 108

Note:
Clear Voicemail Icon lets you manually reset the Voicemail icon if it
continues to appear in the Phone application title bar even after you
have listened to all your voicemail.
TTY/TDD enables you to use your device's phone if you are hearing
impaired. Select Default Mode to send and receive text. Select VCO Mode
(Voice Carry Over) to send voice and receive text. Select HCO Mode
(Hearing Carry Over) to send text and receive voice. See the following
section, "TTY Use With Sprint PCS Service," for more information.
Ask to add unknown phone numbers after calls displays a prompt asking
whether you would like to add the unknown phone number to your
Contacts list when you complete a call.
5.
Select OK.
TTY Use With Sprint PCS Service
A TTY (also known as a TDD or Text Telephone) is a telecommunications device
that allows people who are deaf or hard of hearing, or who have speech or
language disabilities, to communicate by telephone.
Your device is compatible with select TTY devices. You can connect a TTY/TDD
machine, headset, or hands-free kit to your device through the headset jack while
this mode is enabled. Please check with the manufacturer of your TTY device for
connectivity information and to ensure that the TTY device supports digital
wireless transmission.
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Some older answering machine systems may not recognize short tones.
Section 2B: Using Your Device's Phone Features