The World Health Organization has concluded that serious health effects (e.g. cancer) are very unlikely to be caused by cellular phones or their base stations, and expects to make recommendations about mobile phones in 2007–08.
However, some National Radiation Protection Authorities, i.e. Austria[1] Germany[2] and Sweden,[3] recommends their citizens to minimize radiation. Examples of recommendations are:
· Use hands-free to decrease the radiation to the head.
· Keep the mobile phone away from the body.
· Do not telephone in a car without an external antenna.
From wikipedia