Block Unknown Numbers on Iphone

I have an iPhone and I want to block unknown numbers.  Is this possible?
Stacy RichardCustomer Relations Asked:
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Lucas BishopClick TrackerCommented:
Create a contact with phone number 000-000-0000 and add it to the blocked caller list in iOS.
RaminTechnical AdvisorCommented:
Activate Do Not Disturb when "Do Not Disturb" is enabled, only numbers in your contacts will get through.  

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Stacy RichardCustomer Relations Author Commented:
Lucas Bishop - Created the contact  using 000-000-0000  under Unknown and No Caller ID  *67 and tested this out .  Both times it came through.  Thank you for the suggestion.

Ramin- I do not want to block all numbers that come up with No Caller ID and Unknown.  Thank you
Stacy RichardCustomer Relations Author Commented:
Thank you .
RaminTechnical AdvisorCommented:
You're welcome.
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