The point is it's not, though. As a society we have generally established that it is rude to be speaking out loud on the phone in public. Especially on the bus or the train or waiting for same or in the shop or at a movie or any number of other places. I genuinely think it would be easier instead to list the places where it would be okay (in a busy street, if you step to one side). Even in these places there is some expectation that you show a little shame to be doing it, as though you didnt want to but had to because the call is important
The point is it's not, though. As a society we have generally established that it is rude to be speaking out loud on the phone in public. Especially on the bus or the train or waiting for same or in the shop or at a movie or any number of other places. I genuinely think it would be easier instead to list the places where it would be okay (in a busy street, if you step to one side). Even in these places there is some expectation that you show a little shame to be doing it, as though you didnt want to but had to because the call is important