Samsung SGH-zx20 Series User Manual page 148

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Group Index: allows you to list, add, or delete CUG index numbers.
If there is no CUG index stored, you are prompted to add a new index when
you select this option. Once you have added a CUG index, the list of current
CUG indexes appear
Add a new CUG index as advised by your service provider, or delete a group.
Highlight option(s) and press the
2.
Repeat this step until you have selected all desired options.
Press the Save soft key or the
3.
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key. A checkmark appears in the box.
key.