Hello! Last May I was given an iPad 3 Wi-Fi + Cellular as a gift. I generally use my iPad at home, connecting to my Wi-Fi router, so I never signed up for any cellular data service. Of course I frequently get the message "No SIM card" but that's not a problem for me. Now I have a doubt: I know that my iPad emits Wi-Fi radiations, but does it send out cellular type radiations too (even if there is no SIM card installed)? Thank you B.