BBC NEWS has a feature on Five ways mobiles erode etiquette. Aside from clients who feel they are aloud to be late my biggest problem is with peers in the Mobile space who hold executive posts.
A number of friends have become very good with time keeping once they have left corporate jobs to work for themselves. All of a sudden when they have lost the large numbers of co-workers who report to them they are once again able to make that meeting on time. With one friend who is a Partner in a large firm the only way to get him to turn up close to the agreed time is to make sure that you are the first person he sees that day.
I am surprised that the fact that we do not turn phones off when we meet someone is not seen as poor form more than it is.