1 - I understand that nothing can offer protection on a plastic phone vs some mower blade.
2 - I'm tied in 24/7.  My wife doesn't like it sometimes, but I make my own schedule, do what I want to being ido every day for work, but I need to plan it be it a job site visit or work on the computer.  Not being tied to a desk 8 hours a day or a 8 hour "shift" has it's advantages, but it also has its disadvantages. 
End of the day, I'm grateful that I make ok money for my job, but added, I'm not tied to a standard weekly or yearly working schedule. 
 
Don't get me wrong, my wife will tell you that I work at least 50-60 hours a week for work, but when YOU decided you need to get your work done on your own schedule can be a lifesaver when you have other things to do.
A smart phone makes my life a lot easier for work, the downside is it's on my side until I go to sleep.  Wife will also tell you I'm a workaholic.  When my phone rings between 8-5, I answer it.