I spent 12 years in American public school during which greater than 70% of the student body had cell or smart phones and 100% of them were successfully banned. If the phone is visible during the school day and you aren’t currently receiving a phone call from the President or from your parents on their way to the hospital, phone goes in the teacher’s desk. You get it back at the end of the day.

Its not that difficult at all.

they kinda are Ireland, in primary school mostly but even in secondary school teachers are allowed to take your phone for 3 days if they see you on it

What’s the difficulty? If they’re being used they’re out in the open, and if they’re out in the open they can be confiscated.