I agree with you that holding a transmitting antenna against your head for long periods is a bad idea, if the transmit wavelength is comparable to body size or organ size -- generally from 100 MHz up. (That can cause unnatural heating and possibly damage tissues.) That's because of the inverse square law, which tells us that field strengths go up 6 decibels every time you halve the distance from the antenna. If your phone is 24 inches from you while using speakerphone, do the math compared to holding it a twentieth of an inch away when not on speakerphone -- it comes out to be a 54 dB increase. That means holding a 3-Watt phone next to your head is the equivalent of a 753,000-Watt phone two feet away! Huge difference.

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