There is plenty of anecdotal evidence that overuse of a cell phone (especially the older ones with much large SAR values) can be dangerous. An inordinate number of floor traders constantly sending in orders via cell phone ended up with brain tumors on their favored side. This was in the 90s. And also in the 90s, one of my students' fathers was a telephone lineman who used a first gen wireless radio telephone to check the line he just set. He started to get migraines, and they found four separate brain tumors on his right side where he'd used the telephone.
I'll grant you that cell phones broadcast less radiation than those. But why take the chance? I usually use a headset when I call someone on my cell. I usually leave my cell in my pack, not in my pocket near my balls. Simple precautions aren't inconvenient.
The one thing I'll say about VR is this: radio radiation dissipates exponentially from the broadcast source. I'd be much less worried about having the cell phone in a visor 3 inches from my face than I would pressing it up against my ear for a phone call. Also, if you were worried about the radiation, you could put the phone into airplane mode while you had it in the visor.
If Russia stops fighting, the war ends. If Ukraine stops fighting, Ukraine ends. Slava Ukraini!