Could someone explain to me how you put a block on someones phone number, how does this feature work?

Question

once that blocked number calls in to the phone that blocked it, what happens? Do the phone rings, do the blocked number show up in caller id, How can the person who has been blocked know that they were blocked?

Answer 1

i think the people on the other end are the ones having it blocked because it's a private number or something like that.