What am I missing?

Yahoo! News - Smart Phones Will Know When You Can't Answer
Tiny microphones, cameras and sensors reveal body language and computer software analyzes the signals to determine whether someone is too occupied to take a call.

We already have answering machines. Mine stays on all the time, and if I don't make it to the phone within four rings, I was too busy to answer it.

This may be one of those things I won't know how I ever survived without in ten years... but my first reaction is, I don't need a phone that withholds calls because it thinks I'm too busy to answer them anyway.

Now, give me a television that turns itself off N minutes after the last person leaves the room, and we'll talk.