Until about 25 years ago, mobile phones were unattainable for the masses. Smartphones didn't really start to take over until maybe 15 years ago. For decades, the only way to talk on the phone was through a handset connected to the wall, and yes, long-distance charges were a real concern. Even in the early days of the millennium, there were different costs depending on whether you were calling I side or outside a mobile network. We have experienced a quarter century of telecom revolution. So yes, it is time to reconsider all aspects of etiquette.

It is handy to have wikipedia references on hand to answer questions that arise in conversation, but smartphones also distract from interpersonal communication. In school, a phone replaces many tools, but can also be a disruption when misused. I see a dual problem there. We need to revisit our ideas of school, but also teach courtesy. It's not an issue with easy answers.