He went even further and urged his colleagues to use whenever is possible the speakerphone mode or a wireless Bluetooth headset in order to keep he mobile phone away from the head and in general away from the bodyBluetooth is also a radio system. Why not fear that? So you say that it's a different frequency, and very low power? True, and irrelevant:
- Studies that came even close to proving any danger were with AMPS devices, at much lower frequencies; modern phones are quite high frequency
- Modern phones are also much, much lower power than old ones, and adjust power in general to use as little as possible. We're talking milliwatts.