when I talk on my mobile I always turn the earpiece up to max volume & hold the phone away from my head slightly. Try doing this, it's enough to stop you getting headaches. Of course, you cant do this if you are somewhere noisy, like walking down the high street. You could always use the hands free kit...?
It's really dodgy, all this talk of people getting headaches using mobiles. Some research says they are safe, some says they are not, my advice to everyone is to be carefull not to use your mobile for too long each day. Use the hands free, try & keep the phone away from your head... I'm betting in 20 years time half the population will have brain tumors, scary eh? Just a thought.....