Managers always had your number, thanks to the Everbridge Mass Notification System. If not, some managers will ask you directly, for emergencies.
The first few years at Ford, I filled the Everbridge with my office number, and nobody cared. A couple of reorgs later, a manager asked me for my personal number, just for a weekend, in case they need me in an "emergency". Reluctantly, I gave my number. No issues, never received a call.
Then Covid-19 came, we were told to WFH forever, and if we could "release" the office phone numbers for money saving reasons. Most people agreed, including me. When the Everbridge test came near, I was forced to put my personal number, since I didn't have the office phone number anymore.
So I started receiving calls during the weekend. Any issue would cause the teams to escalate, and Everbridge to call me. If I am not busy, I don't mind helping, but getting paid OT was a PITA, and COMP time doesn't work for me (Why would I trade 2 hours with my family on Sunday for 2 hours during office hours when my family is working or at school?). So I escalated to my LL5, and things went quieter.
However, after becoming the single SME for a technology at Ford, and not due to my own actions (Ford laid off my teammates), my manager then requested me, very nicely, if people could call me in an emergency, all OT pay approved. I said yes.
So from time to time, I get a call when people are stuck. I join, fix the issue, get paid. Nothing major, or abusive, so it is manageable and I can live with it. At the same time, I don't feel pressured to "be around" on weekends, just in case if the company needs me. If it happens, and I am not available, is not on me, but on Ford for letting good employees go.