A BBC news:
The impact of mobile phones is not Claire. Some scientific studies show that the use of mobile phones could be linked to headaches, memory loss and cancer. But in fact, there is not an agreement between scientific community. What is clear is that there is a syndrome associated with excessive mobile phone use. Many people find that after a day's heavy use of the phone they have a thumping headache, they feel extremely tired, and their reaction times start to fall off.