If the worst predictions turn out to be correct, mobile phones will slowly begin to kill their users within the next 10-20 years. It is widely accepted by scientists that this is not going to happen. However, some studies have thrown up surprising, and very worrying, results. Background Information Mobile phones, are in effect, radios. They use digital radio signals broadcasting at around 900 MHz and 1800 MHz, hence GSM 900 and GSM 1800.
Digital phones are, however, the most commonly used radio source, and they are on the increase.
The mobile phone masts that receive the signals from your handset and forward them across the country through land line cables can receive and transmit in a honeycomb shape structure. In cities, where buildings and obstructions can halt the signals, the masts may be no more than a few hundred meters from each other. In the countryside, there may be a few kilometers between each mast, and therefore coverage can be patchy. The communication between your handset and the mast is carried out on two different frequencies- 900 MHz for Vodafone and BT Cellnet users, and 1800 MHz for Orange and One2One users. The concern that most experts have is that the source of the radio waves occurs so close to the head, i.e. In the handset, which is held next to the temple.