In message , at 16:46:41 on Mon, 11 Sep
2017, Graeme Wall remarked:

You've raised a *very* interesting point. This survey may be of only
that self-selecting subset of passengers who *do* keep their wifi on
[on the tube].

Which will be most, how many people actually bother switching it on and off?

Who knows? Different demographics perhaps, which is the whole point.

I switch my wifi off whenever out and about because it's too patchy to
warrant the battery consumption.
--
Roland Perry