Hello Mary,
To block a number, it does not have to be in contacts. You can go to
your recents tab and tap on the more info button. You can then find
the block this caller option and double tap it.
 If you ever want to unblock it, the number will be visible under the
call blocking settings.
This is the way it is on my iPhone running iOS 10.1.1 and I can not
imagine that this feature would have been changed for iOS 10.2.
Also, if you are looking to block or be warned of spam calls, an app
like Hiya is able to do this thanks to the new call kit functionality
built in to iOS 10.

 Hope this helps


On 12/21/16, Mary Otten <[email protected]> wrote:
> I know it is possible to block unwanted calls from a known number. That is,
> you get a call, you don't want to hear from that number anymore, and you
> tell The phone app to block anything more coming from there. But what I am
> looking for is something that would be a bit more proactive, that is,
> something that could, for example, block any call that is coming from a
> number that is either not in my contacts or one that I have not previously
> dialed. Does such a thing exist?
> Mary
>
>
> Sent from my iPhone
>
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