Banning phones successful schools is not linked to pupils getting higher grades oregon having amended intelligence wellbeing, the archetypal survey of its benignant suggests.
Students' sleep, schoolroom behaviour, workout oregon however agelong they walk connected their phones wide besides seems to beryllium nary antithetic for schools with telephone bans and schools without, the academics found.
But they did find that spending longer connected smartphones and societal media successful wide was linked with worse results for each of those measures.
The archetypal survey successful the satellite to look astatine schoolhouse telephone rules alongside measures of pupil wellness and acquisition feeds into a fierce statement that has played retired successful homes and schools successful caller years.
Dr Victoria Goodyear, the study's pb author, told the BBC the findings are not "against" smartphone bans successful schools, but "what we're suggesting is that those bans successful isolation are not capable to tackle the antagonistic impacts".
She said the "focus" present needs to beryllium connected reducing however overmuch clip students spent connected their phones, adding: "We request to bash much than conscionable prohibition phones successful schools."
The University of Birmingham's findings, peer-reviewed and published by the Lancet's diary for European wellness policy, compared 1,227 students and the rules their 30 antithetic secondary schools had for smartphone usage astatine interruption and lunchtimes.
The schools were chosen from a illustration of 1,341 mainstream authorities schools successful England.
The insubstantial says schools restricting smartphone usage did not look to beryllium seeing their intended improvements connected health, wellbeing and absorption successful lessons.
But the probe did find a nexus betwixt much clip connected phones and societal media, and worse intelligence wellbeing and intelligence health, little carnal activity, poorer sleep, little grades and much disruptive schoolroom behaviour.
The survey utilized the internationally recognised Warwick-Edinburgh Mental Well-Being Scale to find participants' wellbeing. It besides looked astatine students' anxiousness and slump levels.
It asked signifier teachers astir whether their students were connected target, beneath oregon supra people successful English and maths.
'On their phones each the time'
Charlie got his archetypal smartphone successful Year 8 - but a strictly enforced prohibition meant helium wasn't allowed to bring it with him until helium started sixth form.
Anyone caught with a smartphone successful the little schoolhouse astatine Twyford school, westbound London, has it confiscated for the remainder of the term, which elder unit accidental is specified an "unpopular" punishment that it works arsenic a beardown deterrent.
Charlie says the smartphone prohibition "forces you to bent retired and chat with your friends".
Now successful Year 13, helium thinks the prohibition successful little schoolhouse has "probably" helped him to walk little clip scrolling societal media - but says tons of his friends are inactive "on their phones each the time".
Colin Crehan, caput astatine Holy Trinity Catholic School successful Small Heath, Birmingham, feels a "moral obligation" to assistance students larn to usage their phones successful a "safe and controlled space".
He says phone-related issues, specified arsenic devices being a distraction from learning, are "miniscule" due to the fact that his students worth the "freedom" they person been fixed to usage them astatine interruption and lunch.
"It's specified a pivotal portion of their lives extracurricular of school. For [teachers to] past spell into the realms of restricting that wrong school, we're yet going to acceptable ourselves up for a conflict which we're not going to win," helium adds.
But students astatine different schools wherever phones are banned person told BBC News they person seen benefits similar little bullying and amended societal skills - factors not included successful the University of Birmingham study. Its authors said much probe was needed successful this country to gully immoderate links.
Ysgol Aberconwy, successful Conwy, changed rules precocious truthful that students' phones are locked wrong magnetic pouches unless a teacher unlocks them for usage during class.
The schoolhouse cites probe suggesting rising loneliness astatine school, and the proposition that time connected societal media is linked to little beingness restitution for immoderate children.
Georgie, 15, says earlier the regularisation change, the ambiance astatine schoolhouse "was rather aggressive".
"There was a batch of fights, and radical would conscionable propulsion retired their telephone and commencement filming it. A batch of radical would get rather upset," she said.
Now, Georgie feels arguments bash not escalate truthful overmuch oregon arsenic often.
"People person got closer, due to the fact that they're talking face-to-face," she said.
It is simply a alteration Georgie's sister Charlotte, 12, recovered "reassuring" to perceive about, arsenic she started Year 7.
Head teacher Ian Gerrard says portion bullying hasn't been "completely eradicated", the pouches person created "a harmless abstraction wrong school" wherever students "don't request to interest astir those things".
Despite the deficiency of clear-cut evidence, Georgie's parent Sarah says she "absolutely" supports Aberconwy's policy.
She says she has recovered it pugnacious not to beryllium capable to connection her children during exam time.
"It would beryllium bully to beryllium capable to sometimes pass with them to beryllium capable to say, 'has everything gone each right?'" she said.
Other schools person recovered that parents wanting interaction with children to beryllium a sticking constituent erstwhile introducing caller rules astir phones.
Within a fewer weeks of The Fulham Boys School successful westbound London bringing successful a "brick" phones-only argumentation successful September, students were "over it", caput teacher David Smith says - but "teething problems" came from parents disquieted astir their children travelling crossed the superior without apps to assistance them.
One pupil precocious got connected a autobus going successful the incorrect direction, and ended up astatine the different extremity of the enactment to his location neighbourhood - without a smartphone connected him to cheque a representation oregon telephone home.
The survey whitethorn intensify the statement astir whether under-16s should beryllium stopped from having smartphones altogether.
Some schools say it is down to parents to act.
The Conservative Party is among those pressing the government to tighten up restrictions wrong schools.
Labour has antecedently said the reply could prevarication with a societal media prohibition for under-16s like successful Australia.
Responding to the University of Birmingham study, a authorities authoritative said teachers already had "clear guidance" to negociate telephone usage successful a mode that worked for their schools.
The Online Safety Act, which volition soon travel into effect, would support young radical from harmful contented and guarantee they had an age-appropriate acquisition online.
"More robust grounds is needed to scope wide conclusions connected the interaction of smartphones connected children, which is wherefore we person launched our ain research, led by the University of Cambridge, into the interaction of societal media connected children's wide wellbeing," the authoritative added.
Additional reporting by Branwen Jeffreys and Hope Rhodes.