Alex Pentland of MIT has been working on mobile big data (as are we at LIRNEasia). Here is a snippet of an interview in the NYT:

The phone tracks our movements, as well as our calls and texts, so it can reveal a lot about our daily lives. What did you learn about yourself by studying your own cellphone data?

That I’m very predictable. We tend to pay attention only to the new things in our lives. Meanwhile, our habits are invisible to us. You may say you don’t always eat Tex-Mex food, but if you’re always at the Tex-Mex restaurant, I’d have to disagree.

If you were to look at my cellphone data, could you predict where I’ll be next Tuesday?

Probably.