Hi guys, I've had Nokias, Blackberry for for some many years. Just had iPhone less than a week. I notice that after 5-10 minutes conversations using the speaker phone, my head feels funny. Something i've not experienced before w/ the other phones. Feeling kinda light headed as it something is emitting from the phone. I will try to use the headphones that came w. the iPhone if that would help. I hope this phone is not giving too much "radiation" (if that is the right term) or ultra magnetic something.... Anyone else here experience similar concerns ? Thanks in advance.