Some of my contacts in my phone when added to favorites will show up as 'Unknown' in the favorites list. Or when I make a call to them instead of the name being shown while the call is ringing it says 'Unknown'. They are identical in every way to other contacts. I think it is only new contacts. I can't remember if any old contacts say this. I have tried deleting and re adding them. They contain a first and last name, and a 10 digit phone number. weird...