How can I block a private number?

[iMore Question]

how to block numbers we don't know as a private number and is not listed in the phone book, so only the numbers registered that can be phoned into my iphone4

 

[Bigeric23]

Are you asking how to block a caller whose number is not displayed?

http://forums.imore.com/iphone-5s/297659-how-can-i-block-hidden-callers.html

 

[Wakhid Setiawan]

Yes can i block private number what i must doing with my iphone4

 

[HankAZ]

Yes can i block private number what i must doing with my iphone4

Not with any stock process. Perhaps there are jailbreak options, but that would be the only way.