Samsung S3mini- Is contact hidden or its just an Error?HELP

[AC Question]

Hello,

I have this trouble:
Someone called twice on Samsung S3mini, but the contact is displayed as four stars...What does it mean?
Is that contact hidden in the phone so that the ID doesnt show up? If yes...how do I open it.
If not, then what is it, en error?

THANKS everyone!

 

[belodion]

I think it means they've withheld their ID. If you don't like that, you may be able to set Phone not to accept anonymous calls.

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