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
The former England cricketer reportedly suggested he would have a better chance of being knighted if he "blacked up".
Heavy thundery rain for parts of Northern Ireland and Scotland
Four men are being interrogated in Spain's National Court over the vehicle attacks that killed 15 people and wounded more than 120 others.