German here. My last employer was visibly confused when I told him that I neither have a Whatsapp account nor a smartphone, and didn't want either one. Apparently it was his preferred way of changing shifts last minute and he was pissed that I didn't want to participate in that bullshit. So you want to send me a notification after effing midnight that I have to come in at 5 AM instead of 6 AM? Miss me with that shit.
Luckily I found a better job elsewhere (and they do NOT require any social media accounts - if they want to change something, they call me and ASK whether I am ok with it).
Mine used to give me a stipend and when they stopped that I told them I won't be using my personal phone for work anymore. They never called or gave me shit over it. My old boss called me once after that but that was to go get a beer.
If you want the real answer, I had already typed him realized it could have been a woman so then did slash her. Them would have been easier if I had started that way. The way I did it I'm not sure which was easier. But it's what I did and I'm sticking with it.