Samsung SPH A740 - Manual (Page 40)

31 Phone Basics
TTY Use With Handset
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 phone is compatible with select TTY devices. Please check with
the manufacturer of your TTY device to ensure that it supports digital
wireless transmission. Your phone and TTY device will connect via a
special cable that plugs into your phone's headset jack. If this cable
was not provided with your TTY device, contact your TTY device
manufacturer to purchase the connector cable.
To turn TTY Mode on or off:
1. Press followed by the left
softkey . (A brief explanation of TTY Mode will display.)
2. Press the left softkey again to continue.
3. Press the navigation key up or down to select Enable TTY
or Disable TTY and press to save and exit.
Note: In TTY Mode when your headset is plugged in, your phone will
display the TTY access icon. If TTY mode is enabled, the headset cannot
be used.
IMPORTANT 911 Emergency Calling: We recommend that TTY users
make emergency calls by other means, including Telecommunications
Relay Services (TRS), analog cellular, and land line communications.
Wireless TTY calls to 911 may be corrupted when received by public
safety answering points (PSAPs) rendering some communications
unintelligible. The problem encountered appears related to TTY
equipment or software used by PSAPs. This matter has been brought to
the attention of the FCC, and the wireless industry and PSAP community
are currently working to resolve this.