Stop it
There is some good information on other post such as the fact that most of the numbers are not real that are calling you. However you shouldn't block everything just because it's not in your phone book because a lot of times doctors will use other numbers to call you to remind you for appts,
However if you do want to do that that's the risk you run.
The only other way to really block is to either talk to your phone company to see if they have blocking software to put on.
Or to go to your app store and download something like a robo block application. Some of these will answer the phone for you and require the caller to press a number before it goes through probably. This will stop 99% .
Or just do what I do and block everybody from calling you which does not stop people from leaving messages but at least then when you see the area code you can just delete it.
Almost nothing is important to be able to have to answer immediately.
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