WhatsApp users can choose who can see their profile information (including their name) through privacy settings.
They might have it set to "My Contacts" or "Nobody," meaning you won't see their name if you're not in their contacts or if they've chosen not to share it with anyone you're not in contact with.
This is entirely different scenario. The caller has added me to their contact. Still the fit3 can't display the caller's name. While the phone can show who's calling.