Nokia 8850 - Set up a Closed User Group

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• Set up a closed user group
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This network service specifies the group of people to whom you can call
and who can call you.
Preset
resets the phone to use a user group that the
SIM card owner has agreed upon with the service provider.
Note:
When calls are limited to closed user groups, calls may be possible
to certain emergency numbers in some networks (such as 911 or
other official emergency number).