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You can select settings for call barring on your phone. Follow these instructions to select settings for call barring.
Find "Call barring"
Press the menu icon.
Press Call settings.
Press Call barring.
Select barring option
Press one of the following options:
Outgoing intl roaming
Incoming intl roaming
Key in your barring password (default is 0000).
Press the Home key to return to standby mode.