It isn't limited to just the mobile network signal now. New types of waves additionally burning your brain/heart/whatever include Bluetooth, GLONASS/GPS, Wi-Fi, etc. Dual SIM phones further increase the amount of phone network waves emitted.
Formerly Senior Analyst at Grail Research (an Integreon company; formerly a Monitor Group company). Graduated in Computer Science & Engineering from Delhi College of Engineering (University of Delhi). All opinions expressed here are my own, and are not associated with any of my employers. For more information about me, visit http://www.google.com/profiles/rishabhsingla2002