Fun fact. If your iPhone is in your pocket and gets a notification, it actually transmits far higher-frequency radiation via
its ****ing display.
Radio frequencies are non-ionizing; they simply aren't high-energy or high-frequency enough to be a problem.
Look at the spectrum, this isn't rocket science
. You see X-Rays and Gammas? That ****'s dangerous. Ultraviolet? Also kinda dangerous, which is why we wear sunscreen. Under that, the only dangers are with intensity. A laser can burn you, but it's not gonna give you cancer. Same with microwaves. The intensity of what can go in and out of your 2-8w pocket brick isn't gonna be worth writing home about unless your battery shorts.
Much like most radiation (including the actually dangerous, ionizing type), the "federal exposure limit" is probably based on an arbitrarily measurable number rather than any real clinical studies.
Man are we a stupid species.
Fun fact: the federal radiation limit for tritium in drinking water is ~700 Bq/L. We tried
finding an actual carcinogenic link on mice drinking the stuff at 1,110,000,000Bq/L (yes, that's billion) and couldn't find any DNA damage. Not cancer, mind you, we couldn't find
any DNA damage whatsoever. At people-scale, that's roughly 260,000,000 Bq/L. A 1-banana-a-day-equivilant is about 7,000 Bq/L. Federal hasn't changed, though.