how to use electronic devices in public

I think it is okay to use mobile devices in pubic. However, we should consider the right time, right place and right occasion. For example, calling in loud voice at a train makes passengers angry. Comparing this kind of unpleasant users, most people only use cellphones for text, listening to music or enjoying game apps quietly. I believe there is no differences between reading newspaper and using cell quietly. And most of all passengers might agree these way of using electronic devices in public. In addition, recently elder people started to use mobile phones such as "rakuraku-phone(simplified phone)" and THEIR CALL is annoying us... It means this problems doesn't based on generations. Of course, even if you use such mobile devices quietly, you should power off at prohibited areas. Some train companies offer the "No-cellphones seat/car", and Hospitals and Airplanes are banned to use all time when you are staying. In above areas, Don't be silently users!