Okay so this is one of those moments where user experience is key and they failed. What the phone is trying to tell you is that the person's phone number isn't saved to the actual phone. It's a Samsung, or Google contact, but there's no number in the contact information that's on the device storage. If you look at the tabs across the top when editing your contacts "Samsung | Phone | Google" and touch Phone. The phone number field is empty, because you're using the contact from your google account, or you Samsung account.
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