One of the global trends is explosive growth of cell phone users. In United States, there are 285 million cell phones in use as of Dec 2009 according to
Wikipedia, and that's 91% of entire US population having a cell phone. Remarkably there are countries that have more cell phones than people. As of now (November, 2010) US may well be on the course to join these multiple cellular device countries with increasing Amazon Kindle and Apple iPad popularity.
Cell phone has clearly revolutionized the way we communicate, provided important tools for social networks, and became a lifeline to connect far-flung population in remote areas of developing world. It has become an essential part of our lives for all.
But there is growing concerns that indiscriminate cell phone use are jeopardizing public health. The cause for concern is cell phone radiation.