My previous boss chastised me for missing an early Monday morning meeting. It turned out he had scheduled it the night before, Sunday at 10pm -ish. The meeting was scheduled to start an hour before I normally got to the office. He pointed out that my company provided phone kept me connected to my email inbox and my meeting schedule. He was shocked when I said I turned off alerts for email and that I didn't regularly check it. I told him simply, "you don't pay me enough to be at work 24/7".
I'm actually on call 24/7. I have the volume turned up to max so I know if I get text messages or phone calls, signifying something important. The audio alerts for email is turned off because otherwise I could never f*cking get to sleep because the email is relentless.
I told the replacement boss that I will not be changing this policy under any circumstance. He knows I am absolutely serious. If they ever make an issue of it my response will be to hand over the phone and announce I am no longer on-call.