I was salary at my last gig. Based on 8 hours/day. Work day was 7-4 with a one hour, mandatory, unpaid lunch. We’d get a few bucks an hour for carrying the phone when on call, compensated if we got a call.
They decided to stop paying us for being on call over the lunch hour. All of us started leaving the phone on our desk for that time. Management insisted we needed to carry and answer it even though we were not being compensated in any way for the hour. They lost that battle, and when something went sideways and became a much larger problem because there was no one around to answer call, they started paying us to carry the phone on our lunch hour again.
Expecting someone to answer work calls during non-work hours when they’re not being compensated is asinine. The a**h*** that ran our department drove off a very good, very hardworking, underpaid professional engineer by taking him to task for not answering his phone at quarter to ten on a Friday night. A month later he was making twice as much at a different place.