The "world's biggest investigation" into the effects on the developing brains of children has been launched, the Department of Health has announced.
An estimated 2,500 school children will take part in the Study of Cognition, Adolescents and Mobile Phones (Scamp) as they have functions like memory and attention span tested.
Children aged between 11 and 12 will take part in an initial series of tests before being examined again two years later.
The World Health Organisation (WHO) ranked forward-looking studies of the effects of mobile phones on children and adolescents as a "highest priority research need".
More top news
Outbreaks of rain in the southwest will spread across Wales and central and southern England this evening and overnight
Owen Smith has been sacked from Jeremy Corbyn's shadow cabinet after calling for a new EU referendum.
Scotland Yard says the seat will be preserved as potential crime exhibit in the investigation into the attempted murders.