https://www.quora.com/How-dangerous-...-mobile-phones
That's one article about it. When I bought my first cell phone, I used the European standards for safety. At that time (maybe still today?) they were more strict than the American limits. But I don't go around with the phone glued to my head, lol. Funny how a lot of us barely even talk on a phone anymore.
It's probably something worth looking into, although maybe they're all safer than they were at first.