Just under half of UK parents, 49%, think their child's school should ban mobile phones, a survey by price comparison site uSwitch suggests.
One in eight parents said their child's school had already done so.
The survey, of just over 1,000 people, also suggested that the average value of gadgets taken to school by each child was £301.
Last year, the then-culture secretary Matt Hancock said he admired schools that had enforced mobile phone bans.
However, some have argued that bans prevent children from learning how to "self-regulate" their use of electronic devices such as smartphones.
The survey, carried out by Opinium on behalf of uSwitch, suggested that the average cost of gadgets taken to school by children was rising.
Extrapolating across the total population of UK school pupils, uSwitch estimated that the value of all gadgets taken to schools in 2019 will reach £2.3bn.
Plus, 43% of children now have a newer model of phone than their parents, and in total adults are spending £13bn every year on phone bills racked up by their offspring.
