Why do you think is there someone with such free time and energy to call your number and disturb you? You cannot confine yourself at home because there is a danger of accident out of home. This is the rule of this absurd world! There are always dangers, but until you're alive you have to confront them. Actually I believe virtual space is safer than real world! Anyway you can block anyone you want (actually you don't want!) at the phone, I think...
I don't even associate my phone number with my work anymore. I used to put my phone number on advertisements and such, but I would get phone calls at all hours of the day. I once had someone call me in the middle of the night.
Some people nowadays expect people to be "on" at all times. I have a friend whose boss would text him at all times. I asked him if he could put his phone away while we were hanging out and he said that his boss would get mad at him if he didn't respond immediately.
I used to have a journalism job where my boss would text me anytime she wanted, and give me assignments even when I wasn't working. At one point, I was on vacation and she texted me and asked me to write an article—for the next day. That was the moment I knew I had to quit. (There were other reasons, but that was the final straw.)
I've been thinking of getting a second phone number just for work that I would turn off after my workday is over. That's the only way I would give out my phone number for work reasons. I find it strange that people think you're not fully committed to your job if you don't dedicate some of your private time to it. I'm fully committed to my job but equally committed to my free time.
Sara, I don’t share my private phone number either. I also refused to take lessons with a teacher on WhatsApp. I reserve this App for friends and family, to share photos, text and make calls when abroad.
I think that those people who easily give their number, are people who often change their phone provider and their number, so they do not care.