Closed User group (CUG) is a supplementary services provided by the mobile operators to mobile subscriber's who can make and receive calls from member associated within the group. This service applicable for SMS also. There will be administrative owner who will be responsible for invoicing. Irrespective of this a CUG member can make and receive calls to and from other networks ,other then CUG group too...
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Also known as: Closed User Group, CUG1