Let me seem arrogant again: I am never caught out by 15 minutes. In fact I am nearly always early and make sure any waiting is done by me at the meeting end - reading or something. I do a lot of private teaching and get met by drivers at certain places. The drivers know that I will be early and get there early themselves. It makes the whole process rather relaxed.
If I can start a lesson or meeting early, I will. That too seems to be so rare nowadays that I get no complaints.
I have to ask, if the mobile is so important to you now, how did you live when you were younger? I said right at the top that I accepted that some people have jobs for which a mobile really helps and that my situation was different. Furthermore, making a landline call in an emergency is extremely easy in HK - there are phones within easy reach; everything is within easy reach. Given a major problem like an accident, either I walk a few metres to a landline or I am unable to make a call anyway.
I cannot stress too highly the value I place on not being disturbed. This includes travelling. I do a lot of deep thinking while travelling and use this as part of my preparation. When I travel with others, their frequent phone calls and messages to adjust arrangements are a strong incentive for me to remain a holdout.
It was a common joke when mobiles first came to HK that owners would be talking on trains/buses and saying, 'I'm on the train now. It's just approaching Station A... It's leaving now, I'll be at Station B soon...' and so on. It is still true. Commentary speak.
Last year, after about 20 years of this, the BBC carried a wonderful report about mobile usage and said that the most common message of all - in a major survey - was, 'I'm eating a sandwich now'.
And, as cards are being played here, I'll add another one: I do not find it easy to hear what is said on a mobile by people who are in a public place. There are technical reasons for this, not just biological ones. My wife has learnt not to give me her mobile if someone calls when we are out.