I wish they had one of these for blocking unwanted calls. Unavailable, private or blocked as well as select numbers i just don't want calling me. Do not call list isn't enough. AT&T won't block unavailable calls. I'm not changing my number. I know that is supposed to be the solution, but no, I shouldn't have to do that.
If someone can make an app to block any call i want including Unavailable, private or blocked, that would be great. I'd pay for that.