Excerpt from this article:
If you leave your job, chances are your pattern of cellphone use will also change. Without a commute or workspace, it stands to reason, most people will make a higher portion of their calls from home — and they might make fewer calls, too.
Now a study co-authored by MIT researchers shows that mobile phone data can provide rapid insight into employment levels, precisely because people’s communications patterns change when they are not working.
…“Individuals who we believe to have been laid off display fewer phone calls incoming, contact fewer people each month, and the people they are contacting are different,” says Jameson Toole, a PhD candidate in MIT’s Engineering Systems Division, and a co-author of the new paper. “People’s social behavior diminishes, and that might be one of the ways layoffs have these negative consequences. It hurts the networks that might help people find the next job.”