If the EM sensitivity thing is real..
.. then London's City must be hell for such people.
For my sins I've wandered into London for a few days, and I was at St Paul's in an office connecting to a WiFi setup. It's a good thing the lists sorts by strength because I would have needed it in portrait format to fit on the screen. I really wonder if it's not possible to design a torch that uses that energy to charge - there's plenty of it in the air there.
Add to that full 4G connectivity and I'm certain the air must almost glow there at night.