The Education Review Office has said schools need to get tougher on enforcing phone bans. 

Research found that only 50% of students are following the rules, a number it says is not good enough. 

Mount Albert Grammar Headmaster Patrick Drumm told Mike Hosking that the study needs to be unpacked further, as it's likely that students are using their phones outside of lessons instead of in a learning environment. 

He said that it's been a 'successful initiative' so far, but says it's an ongoing process to reduce numbers further. 

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