French lawmakers have secured a deal on a bill that would outlaw the use of mobiles phones in schools starting in September, one of Emmanuel Macron's pledges during last year's presidential campaign.

Students will now have "the right to disconnect," Cathy Racon Bouzon, a deputy in Macron's Republic on the Move (LREM) party, tweeted on Thursday.

Teachers have been calling for the ban to curtail a growing distraction in classrooms, with nearly nine out of ten French teens aged 12 to 17 now owning a smartphone.

Besides cutting down on screen time, the bill also aims to protect children from dangerous online content such as violence or pornography, as well as cyberbullying.

It also makes it easier for teachers to confiscate phones if necessary.

Each school will decide how to apply the ban, for example by making students hand them over when entering school premises or requiring them to keep them turned off in their backpacks.

Education Minister Jean-Michel Blanquer had defended the government's plan in June as "a law for the 21st century" and the "technological revolution".