Selectively share PART OF a contact instead of the whole thing. So lets say you want to refer a friend to a stranger, but you dont want to give the stranger your friends home address, home phone, notes about his kids, etc. Without QCS, theres no way to send only part of a contact using the native iPhone app; its all-or-nothing. But using QCS, you can pull up your friends contact, select (for example) just the cell phone number and work email, and then send just that information to the third party, either by email or as a text message, either as a vCard or as plain text.