Interesting but my cell doesn’t have bluetooth and hence I use a wired headpiece. But then someone said they act like antennas too...not sure what to think.
The wired ones don't. They are perfectly safe from RF dangers. IF cell phones are such a great risk many persons now would have hand cancer as well as actually most people hold their hand over the built in antenna.
The emitted radiation from a wired headset would be a small fraction of the radiation from a Bluetooth headset, which is a small fraction of the radiation from a cell phone. If you’re worried about the wired headset, you probably need to get worried about the radiation from broadcast TV antennas in your city.
I think there is a headset that has no wires in the tube from the phone to the head.
A headset option that avoids the problem with the wire serving as an antenna right to your head, is a heaset with a tube insead of a wire. Here are a couple options:
http://products.mercola.com/blue-tube-headset/
I have one and the sound is as good as using the cell phone itself. (I have a Motorola RAZR V3m.)
YMMV.