Another report from Pew Research‘s “Americans’ Views on Mobile Etiquette”:
People’s cellphone use has injected itself into public spaces. This has blurred the line between private and public as often-intimate and occasionally blustering phone conversations have now become a common part of the background noise during bus rides, grocery shopping excursions, picnics, sidewalk strolls, waits in airport terminals and many other public venues.
To see how people are responding to these changes, people were asked about their views on general cellphone etiquette in public. About three-quarters of all adults, including those who do not use cellphones, say that it is “generally OK” to use cellphones in unavoidably public areas, such as when walking down the street, while on public transportation or while waiting in line. At the same time, the majority of Americans do not think it is generally acceptable to use cellphones in restaurants or at family dinners. Most also oppose cellphone use in meetings, places where others are usually quiet (such as a movie theater), or at church or worship service.