To add a favorite contact:
- Tap Favorites
- Tap Contacts
- Tap Add Favorite Contact to display your phone’s contact list
- Search for the desired contact from the list
- Tap their name to add them as a favorite contact
Tip: If a contact is greyed out there isn't a phone number within their contact information. When syncing across different services, sometimes email address are only transferred over with the name, not a phone number.