I've been interested in Schumann Resonance relating to Tesla's ideas for wireless energy transmission, which is slightly off topic, but my attention was caught by the beginning of this video. BTW I watched the whole thing.
I am very sympathetic to the idea that more research on cell phones, WiFi radiation etc. is greatly needed and the movie makes a good case for the cause. Nonetheless, in the interest of scientific truth, here is an article from skeptoid.com that refutes the ideas in the beginning of the video:
https://skeptoid.com/episodes/4352
Another thought was that new big data medicine could research electrosensitivity by comparing the addresses of people experiencing cancer and other diseases with the physical locations of electromagnetic wave sources.
Locate cell towers in your neighborhood here: http://www.cellreception.com/towers/