Ok, this might be a wake-up call to drive home the ironical point!
Everyone knows that excessive cellphone usage is harmful. Also, as always, everyone is a resident expert on how it harms, though no one knows how it actually harms, beyond the two-minute cellphone-you-know-what-radiation-cancer spiel. Here is a report, with references and credentials on how radiation from phones and towers really cook you. To whet your thinking
SAR (Specific absorption rate) - Rate at which radiation is absorbed by human body, measured in units of watts per kg (W/kg) of tissue. In USA, SAR limit for cell phones is 1.6W/Kg which is actually for 6 minutes. It has a safety margin of 3 to 4, so a person should not use cell phone for more than 18 to 24 minutes per day.
This information is not commonly known to people in India.
There is quite a bit of theory, empirical data from research, and analysis stuff that Electrical Engineers might decode better (the author is a Professor from IIT-B). And there's quite a bit on the Medical stuff as well. But to cut the conversation short, the cancer theory might not just be theoretical.
Please do take the effort to go through this document. If you can't access it, please let me know and I will be glad to forward it to you.
Userid: praveen.prabhakaran@gmail.com
Password: Radiationhazard9