YOUNGSTERS spend up to seven hours a day on their smartphones, showing numbers.
An Ofcom study shows that nearly a fifth of 16- to 24-year-olds are online for this time.
Three quarters spend the equivalent of two days a week on their phones and a third at least 40 hours.
Young women are more addicted than young men, who spend an hour on average on their cell phones.
Teenagers are twice as likely as the rest of the population to be online so much.
However, the Ofcom study also showed that adults spend more and more time on their cell phones and other devices, with four times as much online content for more than 40 hours a week than in 2007, when the iPhone was released.
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Adolescents admit that they are more productive when cut off from the Internet, and more than half say devices break time with family and friends.
Tanya Goodin, founder of the digital health consultancy Time to Log Off, hopes that the results will give young people a wake-up call.
She said, "It affects not only people's relationships and productivity, but also mental health."