I'm working at IIT Bombay.I read the article. It's very good but Dr Chris Desouza, ENT consultant with Holy Family Hospital, Leelavati Hospital and Tata Hospital, Mumbai, says use of cellphone gives exposure to ionizing radiation. This is not true, actually it is non-ionizing radiation. Ionizing radiation emits from radio active materials. Still non-ionizing radiation are harmful for human health if exposed to a long duration.For more information, mail to ssatav@ee.iitb.ac.in