A lot of this depends on your industry, your particular company, and your boss.
I worked at a megacorp as a developer, and I was on call for 4 months out of the year. I supported the custom application the company used to do R&D budgeting, and I got called almost every night during that time period. For years. Then we got a new director. He found out that 2 of us were doing that level of support and put his foot down with the business. My on-call time went down drastically. (*I will note that I was paid quite handsomely at this job, both in money and in delicious cake that showed up on my desk the day after a particularly heinous night.)
Then I worked at a hospital as a report writer. My group was also responsible for supporting the application on the server, so I still had to be on-call for a week at a time.
I'm back in my original industry now, at a much smaller company, and I'm only sort of "on call". If the reporting server goes down, they'll try to contact me, but if they can't reach me we do a collective shrug. I'm working to convince them to let me train a guy in our overseas office to do basic support, so they don't even have to try to call me. I have a work phone but I almost never remember to carry it after hours, and my boss is aware of that and okay with it.