SecondContacts Lite is a application for exchanging a contact via QRCode.
This App creates and read a vCard formatted QRCode. It is stored in your AddressBook which is shared with Apple Contacts.
Also The top page of SecondContacts Lite shows Phone, Email, Address, Instant Message or Social Network address together with the contact name. You can call Phone or launch Apple Mail by holding the touch on a phone or a email address on the page.