The vast majority of the time I work in the shop by myself. I did run a phone line to the shop last year and have a portable handset I can lay on the bench or somewhere out of the way. We don't get a cell phone signal out here and I don't have one anyway.
Like Thomas I also have a bell mounted on a post outside the shop. Mostly I use it to call the dog.
My wife and the Devil Child have grown accustomed to my "racket" so I would have to bang for a long time to get their attention. Be better off catching their attention waving a $100 bill in the air. Even out of line of sight I'm sure they'd sense it and come a runnin
Seriously though I have a phone and a dinner bell which is alot more than I have had most of my working life so I feel fairly secure. The most dangerous part about it is that I am working with ME
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John