I agree that on my other two phones, many incoming calls say "unknown", but many also state the name associated with the phone number. Unless a caller has specifically set their phone to not display their name it is supposed to do so. It works that way on my Galaxy S4 and HTC One. I just had a friend call my S4 who is not on my contact list. His name appeared along with the phone number. That's how caller ID is supposed to work.