The industry’s $4.7 million contribution to the WHO appears to have had its most telling effect in May 2011, when the WHO convened scientists in Lyon, France, to discuss how to classify the cancer risk posed by cell phones. The industry not only secured “observer” status at Lyon for three of its trade associations; it placed two industry-funded experts on the working group that would debate the classification, as well as additional experts among the “invited specialists” who advised the group.38
The purpose of the study was to investigate the effect of 2.45 GHz microwave radiation (2 h/day for 35 days) on the male rat brain. MWR-exposed rats showed significantly increased comet head, tail length and tail movement, as well as decrease of antioxidant enzymes. Researchers conclude that the chronic exposure to these radiations may cause significant damage to brain, which may be an indication of possible tumour promotion.
A peer-reviewed Jan. 2012 study in the Journal of Neuro-Oncology concluded that RF radiation "may damage DNA and change gene expression in brain cells" in mice.  An Aug. 2009 meta-study found that RF radiation "can alter the genetic material of exposed cells."  A 2004 European Union-funded study also found that cell phone radiation can damage genes.  On May 26, 2016, the US National Toxicology Program (NTP) released the first results of its study on cell phone radiation, finding an increased incidence of malignant tumors of the brain (gliomas) and heart tumors (schwannomas) in rats exposed to RF radiation.  The NTP researchers also found DNA damage in the rats exposed to the highest levels of RF radiation.  On Nov. 1, 2018, the NTP released its final peer-reviewed report, concluding that there is "clear evidence of carcinogenic activity” in male rats exposed to RF radiation. 
Have you ever felt more awake after using Wi-Fi or even struggled to sleep through the night? Reports of these phenomena have been frequent and even prompted a study in 2007 that evaluated low-frequency modulation from cell phones and its impact on sleep. Participants were exposed to the electromagnetic signals from real phones or no signal from fake phones. Those exposed to the electromagnetic radiation had a significantly more difficult time falling asleep and changes in brainwave patterns were observed. 
While that’s all scary as heck, I think it’s everything we don’t know about EMF exposure that scares me the most. That, and how seldom EMFs are discussed. If it hadn’t been for my dear friend August Brice, a Tech Wellness Advocate, I don’t think I would have ever considered the safety hazards associated with everyday cell phone use. Or had any knowledge of the subject whatsoever. Let’s be real, this topic has certainly never appeared in the trending tab on Twitter, and I’ve yet to see it spark a viral video.
There are many “personal safety apps” available for download that offer to increase the users’ personal safety – immediately connecting them with 911 or select trusted individuals. Several of these apps are designed and marketed specifically to survivors of violence. Before relying on any safety app in an emergency, be sure to test it out with friends and family to be sure that it works correctly for you. Your trusted friend may not receive your location with your emergency call or may not receive your call for help at all. Always know the quickest way to access 911 on your phone in case of an emergency. Many phones have a quick emergency call button that you can even dial without entering the phone’s passcode.
What does this tell us about Wi-Fi? Wi-fi routers are weaker transmitters even than mobile phone masts, and users sit away from them. The level of energy produced by a Wi-Fi router is very low, far too low to be able to disrupt DNA, so there is no mechanism for it to be carcinogenic. It’s true that it’s the same frequency as microwave radiation, but it’s so low power that there isn’t even a noticeable heating effect, never mind breakdown of genetic material. The ‘hot ear’ effect that you notice after a long call comes from the battery warming up, not radiation. It’s just too weak to do anything, even if you’re sitting close to it.
It is useful to be aware of new health research regarding cell phone usage and cell phone radiation. The first cell phone call was made in 1985 and that phone cost $5,000 and weighed about 9 pounds. The change in size, weight and cost of devices today has probably led to over 50% of the human race owning a mobile device, the fastest growing technology on the planet.