Do you remember the days of the old school yard, when we used to scroll Twitter at lunchtime?

Otago Boys' High School rector Richard Hall hopes those will not be the memories his students take away from school.

Students are now banned from using their phones during lunch and interval and will face consequences if they are caught using them.

Hall said the move was inspired by the results of the Built Environment and Active Transport to School (Beats) study, which tracked the movement and health of Dunedin school students.

Otago Boys' High School rector Richard Hall says parents who need to contact their kids can call the school office. (Photo / Otago Daily Times, File)

Last year, the study collected data from 120 students from Otago Boys' High School and found most spent more than five hours a day on screens outside school time.

By removing phones, students could lower their overall screen time and have more opportunity to get on the sportsfield at lunch time and be active, Hall said.

The rules would only change one hour of the school day, as phones were already not allowed in the classroom.

The school taking a firm stance would mean students would be discouraged from checking their phones between and during classes.

Students caught using their phones would have them confiscated until the end of the day.

Parents would be contacted if offences continued.

Laptops were learning devices and pupils were still welcome to bring theirs to school and use the internet, but phones were not designed for learning.

With the widespread use of technology, people were expected to be contactable instantly, Hall said.

He hoped that by removing phones, pupils' need for that instant communication would lessen and they would instead focus on building relationships face-to-face.

Parents who had to contact their children would still be able to do so through the school office.

He believed that, in the long term, pupils would enjoy and value their time at school more without their phones.

Head boy Isaac Ottrey said there would be boys who would find the new policy tough, but hopefully adapting would take no longer than a few weeks.

"I think deep down the boys know it's good for them."

Waitaki Girls' High School implemented a lunchtime phone ban for its students in years 9-11 at the start of last year and principal Liz Koni said the results had been "overwhelmingly positive".

Students had been reluctant to embrace the policy, but they settled in quickly.

Both teachers and students reported fewer distractions in the classroom and teachers no longer had to manage social media-related incidents that happened throughout the school day.

Students who needed to access learning tools or apps could still do so using a laptop.

There had been very few downsides, she said.

"Having a few more students at the office needing to contact home throughout the day is a small price to pay for the benefits that a cellphone-free school day brings."

- By Wyatt Ryder, ODT