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by otherotherchris 1521 days ago
You can't divide by 4.5kg as the distribution of power into the human head is not homogeneous. It's going to be much much higher adjacent to the ear.

In any case this is burst power during very high bitrate use such as 4k video, loading webpages, or pulling app/os updates. No ones phone is going to push a watt during voice calls. More like a few mW.