TV personalities Matt and Emma Willis said they wanted to be a part of a new documentary because they felt they had "lost their kids" to smartphones.
The two-part series is a social experiment tackling the impact of smartphones and social media on children. The first episode will be broadcast on Wednesday.
Pupils at The Stanway School in Colchester underwent a series of tests with experts monitoring their behavioural changes as they give up their phones for 21 days.
"When we sat down with the parents at the school, our feelings were resonating back at us," said Emma Willis.