Samsung GSM1800 - Manual (Page 134)

Network Services
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Caller ID
(Menu 8.5)
You can prevent your phone number from being
displayed on the phone of the person being called.
Note: Some networks do not allow the user to change
this setting.
The following options are available:
Default: the default setting provided by the
network is used.
Hide Number: your number does not display on
the other person’s phone.
Send Number: your number is sent each time you
make a call.
Closed User Group (CUG)
(Menu 8.6)
This network service allows incoming and outgoing
calls to be restricted to a selected user group. You
can create up to ten user groups.
For details about how to create and use a closed
user group, contact your service provider.
Example: A company lends SIM cards to its
employees and wants to restrict outgoing
calls to members of the same team.
Activating a Closed User Group
If you select the Closed User Group menu, you
can enter the CUG function. You can now access the
following options after pressing the Select soft key: