The fix for that is to wear boxers though. Or not wear anything at all. Your phone is receiving most of the time. And when it transmits it does so very briefly

The fix for that is to wear boxers though. Or not wear anything at all. Your phone is receiving most of the time. And when it transmits it does so very briefly and coalesces background transmissions into a single burst to conserve battery. There's just not enough transmit power to heat anything up, and even if there was, blood would carry the heat away quite readily.