I've always been curious about this feature. Can you see the message that were blacklisted? Or do they not come into the phone at all?
Just go in to Settings > Security & Privacy > put a check next to Show Blacklist and those people will show up on your list like normal.
If you want to manage the list (say, to remove the pesky ex-boyfriend because you got back together) then just click on the Manage Blacklist option and remove his number.
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