LG G4020 - Manual (Page 96)

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Settings
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Closed User Group (Menu 9.3.7)
Closed user group is a network service that specifies the group of people
whom you can call and who can call you. For more information contact
your network operator or service provider. If a group index is specified, it
is used for all outgoing calls. If no group index is specified, the network
will use the preferential index (a specific index that is stored in the
network).
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Preset: Setting the selected CUG Index.
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On: Activating and editing the CUG Index.
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Off: Deleting the selected CUG.
TTY (Menu 9.3.8)
A TTY connection, using an external, especially adapted TTY typewriter
tool, is often used by the hard of hearing, speech impaired, deaf and even
blind customers, to communicate over the cellular network. This type of
connection allows only one user to type at a time, and communication is
one way at any given time and can not be interrupted by the other party by
typing ahead. It is best to keep your sentences short and to the point. Also
try not to ask too many questions all at once. Finally, it is useful to have a
printer handy in order to simplify the process.
Send DTMF (Menu 9.3.9)
You can send the DTMF (dual tone multi-frequency) tones of the number
on the display during a call.
This option is helpful for entering a password or account number when you
call an automated system, like a banking service.
Note Use only PN421-003402 cable.
TTY users must have a TTY/TDD device.
TTY: Tele Type writer
TTD: Telecommunication Device for the Deaf