Cell phone radiation levels are tested and certified to remain within levels deemed safe by the Federal Communications Commission (FCC). The FCC sets the maximum amount of thermal radiation (heat) that cell phones are permitted to emit.  This limit is measured as the amount of radiation absorbed by a user and is known as the specific absorption rate (SAR). In 1996 the SAR for cell phone radiation was set at a maximum of 1.6 watts of energy absorbed per kilogram of body weight. Manufactures of cell phones must test their products to ensure that they meet this standard. Random tests of phones on the market by FCC scientists further ensure that radiation levels meet FCC guidelines. 
Wifi routers can and have still been able to emit frequencies even while turned off. So just, beware of that. I completely got rid of my wifi router at home. It’s to that point. Also save on the cable bill now so it’s a win win. Nope. Don’t need all that radiation just to have a “stronger” Internet connection for all my wireless devices! Haha, so u know what they did? The cable company cut off some channels that were in my package. To try and make me call back and pay to have extra channels. That’s why they ask you, what channels do you watch ? Try try to up sell sell sell you to get you to watch TV all day while your body is getting radiated all day from your wifi. Wether your hyper sensitive to it or not, like some of us are greatly effected, your health is still being effected.
Nevertheless, a group of scientists got together in the mid-2000s, calling themselves the BioInitiative Working Group. This group, which largely consisted of wireless radiation researchers, has written a harsh reply as feedback to the reports claiming that posed no health risks. The reply lists a wide range of health effects scientists at the European Commission have unfortunately either ignored or dismissed.