Elementary school teachers want students to turn off their cell phones.
The Elementary Teachers Federation of Ontario passed a resolution Friday that cellphones should be turned off in classrooms unless a student gets special permission.
The Toronto District School Board allowed phones back into the classroom in 2011 after a ban four years earlier.
The union also passed a motion which would require Wi-Fi transmitters in schools to be clearly marked.
The motions are non binding.
Health Canada says there is no strong evidence that shows exposure to low level radio frequency energy causes health problems.