LG MM-535 Owner's Manual page 49

A TTY (also known as a TDD or Text Telephone) is a telecom-
munications 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.
When establishing your Sprint PCS Service, please call Sprint
Customer Service via the state Telecommunications Relay Service
(TRS) by first dialing
with this number: 866-727-4889.
Press
Select
Select
Select
Read the disclaimer and press
Select or
(left softkey ) to access the main menu.
( ).
( ).
( ). (The TTY Mode disclaimer displays.)
press .
. Then provide the state TRS
.