When I talk on my cell phone (Motorola 830), next to head, after about 15-20 minutes, it often gets hot and I feel nauseous. There must be some way to test the radiation because this can't be healthy? I am one to not really believe in the conspiracy theory about cell phones causing cancer but I only feel safe using one of those Cell Phone EMF Protection Mobile Headset (with the air tube). Just make sure you get the newer version with the piece that wraps around the ear. I have an older version and it falls out of my ear easily. Also use a dab of super glue on the connector, because mine kept falling apart until I did.
EC: There is something you can get to measure EMFs... We bought one about 10 years ago and it still works great. Called Dr. Gauss meter... back then it cost about $45. Cell phone EMFs were TERRIBLE 10 years ago. They have gotten considerably better over the years, but you will still see the meter pulse into the yellow (sometimes red) zone every 10 seconds when the cell phone is just on stand-by. Haven't tested it on a Blue Tooth yet.