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I've recently got two calls on my Samsung Galaxy S3 with stock (TouchWiz) firmware. One was marked as coming from a "Private number", while the sender of the second one was apparently "Unknown". Neither of these displayed a phone number when selected in the call log. Can anyone explain the difference between a "Private number" and an "Unknown" one?

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A private number is that when the caller holds back his phone number with the help of the service provider and the service provider doesn't send the Caller ID information to the call receiver then it considered a "Private Number". To activate the feature ,

Open Dialer > 3 dots > Settings > Call Settings -> Sim related call settings > Additional settings > Caller ID

Note: Not all carriers allow hiding the Caller ID. Mostly it is greyed out for security purposes.

On the other hand, when your telephone exchange(service provider) is unable to register the Caller's number, then it is called then it is called "unknown".

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