I am leaving my mobile phone at home when I go out in my free time. I actually could also leave it at home, while working. I think I am going to do that, too.
I am afraid many people are already in the situation that being available through mobile devices is a requirement in their jobs.
That brings up a good question. I wonder where my phone is?
There are quite a few apps that track people who go into businesses and business districts. I would not be surprised to start seeing places that require that people have a smartphone to enter an area.