>>"The adult human brain is centered at 900MHz. This frequency, as well as its second harmonic of 1800MHz,
>First cordless phones were 900 MHz. Probably did a lot of damage.
>GSM also uses/used 900mhz. Not sure if there are any networks left on that freq these days though. Maybe in 'shithole countries'
US, North American and European/Asian Frequency Bands
https:// www.wpsantennas.com/cellular-frequency-information.aspx