When you take a photo of one or more faces, face recognition tags are automatically added to the faces. You can then link a face with a name by creating a contact in the phonebook for the person whose face is in the photo. When you have given a name to a face, the face recognition feature will add name tags to all photos of that person. When viewing a photo, you can tap the name tag of a person in the photo and then tap to view all photos which include this person. If a face is not recognised, the tag "Unknown" appears. You can tap this tag and link the face to a contact in the phonebook.