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Indeed, the very fabric of society may be threatened.' Although Dr Ishii's research was based on children in Japan, British experts confirmed that the same trends apply in the UK.
Child psychologist Dr David Lewis said: 'The mobile phone, like the Furby or the Rubik's Cube before it, has developed into a playground craze in this country.
This page explains the laws that apply when you use the photo or recording functions on your phone.
For example, even though most beaches are public places, you can get in trouble for taking invasive photos of people in their swimmers without their permission.
Private property is a space where the owner can set rules or restrict entry.
One British child in four between the ages of five and 16 now has a mobile phone.
As well as making calls, youngsters are using their handsets to send millions of text messages to friends each day.