Comment by ellinokon

My father sought to answer the same questions after he started to fear what transmitters might be doing to him/us. As far as I understand his findings, the "strength" of the signal could potentially be as high with blutooth as with 3G/4G, for use with his devices in his environment. His recommendation is therefore to avoid all transmitters close to your body, and prefer wires at all times.

All anecdotal ofc, and I have not in any way verified the instruments he used for his tests.