The old asterisk voice menu system I used to run was pretty good at shutting down telemarketers and robocallers while still letting legitimate callers through. I don't think it'd be so easy to implement on an android phone, although it really should be. Maybe that phone Canonical is working on will have more open standards, but I'm not holding my breath.
They let it run a little too long this time, though. Hybrids and electrics have had a chance to get a foothold in the market, and some people are already starting to think about how pure electric vehicles and ones with fuel cells could potentially change how electric grids work. It wouldn't take a very big push for countries to start adopting electric vehicles powered with Clean Atomic Energy. And that'll plunge us into the next ice age lickety split, once global warming starts to reverse. Hah, didn't see THAT coming, did you?