Samsung SGH-I547ZKAATT - Manual (Page 66)

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Your phone is compatible with select TTY devices. Please
check with the manufacturer of your TTY device to ensure
that it is compatible with digital cell phones.
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.
1. From the Home screen, tap ➔ ➔ Call
settings ➔ TTY mode.
2. Tap TTY Full, TTY HCO, or TTY VCO. A green checkmark
will appear. Tap TTY Off to turn it off.