I was once told it was discourtious to use my cell phone on a NYC bus.

I have walked out of 3 high end eating establishments because they do not have a 30 sec. cell phone policy. For some reason which I do not understand, the cell phone voice must be at least 10 db louder than the surrounding conversation.

Most of my recent eating out has been in better restaurants in Wash DC, London, Paris, and Italy. Only in London have I been abused by frequent loud cell phone use.