Assuming that there was no technological breakthrough necessary to implement this back in iOS 1, what took it so long, and why is it so unexciting in 2012? Did our culture change that much since 2007, that only now do we trust machines to automatically screen our calls?
Apple is the company responsible for visual voicemail and for forcing carriers to implement it. Shouldn't it be really easy for US carriers to implement a DND flag inside a call and push for its standardization, otherwise redirecting to an old-fashioned screening service? I would happily live in a world where people trying to reach me know that I'm busy. People still relying on telephone calls to communicate, that is."