Nice... except that I don't have an i-phone... Or any phone which isn't connected to a wall socket by a piece of wire.
I'm with ya, Steve. I don't have a cel phone, but I do have a pager ($80/yr.) if somebody REALLY wants to get in touch with me immediately. Otherwise they can leave a message on my answering machine at home. Of course, I'm pretty much retired from show biz now. When health insurance got astronomically expensive around the turn of the century, I went out and got a day job with full benefits. But occasionally some band will want me to run sound. As long as it's a few weeks out and fits my schedule, I'll usually do it.
I realize that for busy techs it is almost required these days to have a cel phone, but with the advent of built-in GPS I really don't trust the powers-that-be who seem to want to track everyone, everywhere.