WhatsApp quickly and easily recognizes which of your contacts are using WhatsApp by accessing your phone's address book.

To find your favorites/contacts go to the Chats tab and tap the New chat icon.

If you can't see your contacts:

• Make sure that your contacts are using WhatsApp.
• Make sure that you've saved your contacts' phone numbers in your phone's address book. If they use a foreign phone number, use the full international format.