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If the same contact appears more than once in your phone's address book, you can merge identical contacts so that they will appear only once.
1. Find "Merge duplicate contacts"
Press the address book icon.
Press the menu icon.
Press Organise contacts.
Press Merge duplicate contacts.
2. Merge identical contacts
Press the required contacts.
Press the confirm icon.
3. Return to the home screen
Press the Home key to return to the home screen.