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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 Manually"
Slide your finger upwards on the screen.
Press the menu icon.
Press Merge Duplicate Contacts.
Press Merge Manually.
2. Merge identical contacts
Press the required contacts.
3. Return to the home screen
Press the Home key to return to the home screen.