Blocking "Unavailable" versus "Unknown" calls
I have a Samsung Galaxy Note 4.0 running Android 4.4.4. Until a recent software update, all calls without a number showed up as "Unknown" and these were easily blocked in Settings using a checkbox. Recently, I began to receive several calls a day from "unavailable" and there is unfortunately no option to block that. These calls come through as normal calls. The auto-reject list only accepts actual numbers (plus the Unknown checkbox option) so I have no way to block these calls.
Is there any way to block them? Is there downloadable phone software/apps that are more flexible than the default Samsung/Android/ATT phone software? I anyone else experiencing this same issue?
(Please don't respond with answers like "just don't answer" etc. I'm not answering them, I don't want to accept calls from unknown numbers nor do I want my phone ringing 5-10 times per day and I;m looking for practical advice on blocking the call).
Thanks for any advice!