LG 4015 - Manual (Page 78)

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Settings
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* : Shown only if supported by SIM card
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.
Send DTMF (Menu 9.3.8)
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.