Just to give you all an additional data point, I am based in Europe. I do have business contacts and give out my number freely (on resumes, etc.) I think I've gotten 1 robot call in the past 5 years (my thought was - I knew this would happen sooner or later! I know it's a huge problem! But it didn't happen again.)
I use this phone every day and it's always on. So: if you don't want robot calls, get an international number in Europe.
People who need to contact you can pay the international surcharge.