[empira]

I can tell you that on my side, it is expected that you are completely unreachable when you are not supposed to be working. That applies during your holidays, when you are sick (you still need to open the door to the work's doctor if he comes visit you) or before/after work hours and during the week-end. Not only your boss or collegues wouldn't try to contact you (or would not expect a response), but they would not even try, as it could lead to you (rightfully) complaining to HR.

The reality as always is more complexe. It is true that some role come with an (implied) expectation of general availibility. While it would be your right to decline any work-related phone call, I'm sure it could one way or another impact your relation with your boss, especially if 'it comes with the role'. I guess it all depends on what you want. If you don't want to be answering work calls during your holidays, you can always fake being unreachable. It's not unreasonnable to not have your phone with you at every moment. Or, if you don't mind being reachable, maybe arrange for a predefined time slot (from 9 am to 9.30 am every day) when they can call you, so that you don't have to worry about it all day.