Your photo is from the old IMTS phone days.
I ran such a system in the pre-cellular days .
My “SMART” system could automatically handle TWO phone calls at the same time, hahaha.
As I see the way technology is taking society today, I am quite thankful to be well into my 60s.
Actually...those old mobile phones that used an MTSO to route calls were very high powered as compared to phones in use today. I cannot attest to the frequency used but presumably the risk was higher based on the power output.