Read help info
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 "Suggestions"
Slide your finger upwards on the screen.
Slide your finger right starting from the left side of the screen.
2. Merge identical contacts
Press Merge duplicates.
Press Merge all.
3. Return to the home screen
Press the Home key to return to the home screen.