Samsung SCH-A610MSVXAR - Manual (Page 138)

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TTY/TDD
Your phone is fully TTY/TDD compatible. TTY/TDD
equipment is connected to your phone through the headset
connector on the left side of the phone. TTY/TDD must be
enabled before you can use your phone with a
TTY/TDD device.
1. In standby mode, press the left soft key ( ) Menu , then
press , , . TTY/TDD Lock appears in
the display.
2. Enter the lock code. The default is , , ,
(or #TTY). TTY Full and TTY Off appear in
the display.
3. Use the navigation key to highlight your selection and
press
. You’re returned to the previous menu and the
TTY icon ( ) appears in the top of the display.