The number of power plugs available to the public seems to be very close to zero at
The number of Bluetooth IDs visible when scanning is amazing. It seems that many people have it switched on continuously now (quite different from 2 years ago). The friendly name used by people seems fairly boring, mainly the preset model name of the phone, combination of first name an phone model, initials, full name and the occasional “hi there”. These observations are quite encouraging for one of our projects.
Looking at the scans I wonder if it is likely that people who travel together have similar phones (e.g. same manufacturer).