I am getting robo calls from an UNAVAILABLE number. How can I block these types of calls? There has to be a way. I get 3 a day and they don't leave a message. I just tried to block the "number" but it has to be digits. Need assistance or advise please. Thank you.
Another option for dealing with Unavailable numbers is a third party service called You Mail. It's free and has a feature called Ditch Mail to deal with unavailable or restricted numbers. It does a whole lot more than that too, check it out.