Always happens. If there is no saved contact number there will show the number with 'Unknown' name. If you want to save the number with any name, then you might do that and after that if that number calls, it'll show the saved number.
Sometimes there are some incoming call that indicates only 'Unknown' with no number at all or '0000000000' that means callers have chose to hide ID or that is a VOIP call. Many operator permits to hide ID but not all.
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