Radio frequency (RF) radiation is emitted from appliances and devices at the frequencies at which they operate. Because of disparities in these devices’ proximity to the user, it is difficult to compare the potential dangers of exposure.     The federal government does not dictate an acceptable level of exposure to RF radiation (except for regulating potential leakage from microwave ovens), and cannot measure cumulative effects of using more than one device. (ABCNews.com)

Reporting to the FCC
There’s been no medical evidence suggesting that radiation from mobile phones might cause cancer or other health problems. But at the same time, there’s no definitive proof that cell phone radiation is harmless.
     The radiation reading, known as the “specific absorption rate” is a measure of the amount of radiation absorbed by the body while using a mobile phone.
     Every phone maker needs to report that figure to the Federal Communications Commission when applying for product approval. The FCC began making those readings available in late 1998, but the information was not easy to find and it was not until last month that the agency began making the information more widely available on its Web site.
     The actual radiation measurement won’t be printed on the box of new cell phones, but consumers will be shown how to access the information from the FCC, said Basile. Cell phones will start being packaged with the new information in three to six months.