Moderation might be the key.
+1 as with everything else, moderation. For me having the smartphone allows me to divide a 10 hour day hunting into 8 hours of hunting and two hours of dealing with work. Without it my day would be all work, no hunting. Sure it is possible that I might miss an opportunity when I'm dealing with the phone, but I would have no opportunities on that day without it.
As far as texting goes, I just don't get it, but that's a whole 'nother thread.