Apple iPhone 4G - Manual (Page 217)

Unified Contacts
When you sync contacts with multiple accounts, you might have entries for the same
person in more than one account. To help keep redundant contacts from appearing
in the All Contacts list on iPhone, contacts from different accounts that have the same
first and last names are linked and displayed as a single unified contact (unless they
have different middle names). When you view a unified contact, the title Unified Info
appears at the top of the screen. Unified contacts appear only in the All Contacts list.
The source accounts of a unified contact appear at the bottom of the screen, under
Linked Cards.
View contact information from a source account: Tap one of the source accounts.
Unlink a contact: Tap Edit, tap , then tap Unlink.
Link a contact: Tap Edit, then tap and choose a contact.
217 Chapter 26 Contacts