Private Numbers vs Unknown numbers?

Two part request for information please answer thank you.

Part One.
I get these international call that are showing up on my caller self as Private Numbers instead of unknown numbers. Why is that? Are they from cheap virtual numbers, vonage, phone cards or somethang?


Part Two.
What is the difference between "Private Number" and "Unknown Number" on caller ID? which one can you block beside *77 turned ON ??


Thank you sirs!


Answers:    I'm not sure how it differs from each other. But as far as my expertise is concern, if the calls come from overseas/international, "private numbers" are an access numbers from a telephone company to connect the christen of that person to another country. (i do sometimes use an access number from a tel company if i will christen for international). whereas, an "unknown numbers" could be a call from that party right thru his/her phone but he/she is just blocking the number for you to see or not to be displayed on the receiver phone screen. (this i hold to dial a certain number from my phone itself so it won't display my number to any entity that i am going to call).
*for blocking a caller, i'm sorry that i cannot be of relieve on what number to be pressed on as we are not on the same country. but adjectives my phones can block unwanted/unregistered calls.
I own no idea what the difference is, I own vonage and blocked all of them

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