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If you retrieve your contacts from social networks and add them to the phone's phone book, the same contact may be displayed more than once. You can merge identical contacts so that they will appear only once. Follow these instructions to merge identical contacts.
Find "Merge contacts"
Press the Menu key.
Press Merge contacts.
Merge identical contacts
Press the required contacts.
When the box next to a contact is ticked (V), the contact is selected.
Press the Menu key to return to standby mode.