This comes up all the time. I work with microwaves professionally and it all comes down to strength of signal and length of exposure.
The FUD is good for sales, click-bait, and shows that don't even know the difference between ionizing and non-ionizing radiation. Or, the "studies show" kind of things involve taping a phone to your head 24/7 for years on end.
Parents - stick around as we expose the truth! But right after this commercial break. $$$
In other words, follow the money trail. Whether it's trying to sell you a "detector device", late-night get-rich-quick lawsuits, watching our exclusive stories from "independent studies", (right after the break!), or the latest by going to websites filled with click-bait and aggregate browser data selling, it's mostly designed to profit from fear.