At my old school, phones were not allowed for the first year of my attendance. Then our headmaster, probably one of the greatest headmasters in the country, accepted that no dam would never stand against the mobile tsunami, and that there was indeed an advantage. So he permitted them in the school with the obvious rules: they must be turned off during class. If one goes off during lessons or is otherwise used then they are onfiscated, and it's not easy getting it back (coming back after hours, perhaps with a parent or guardian to claim it). The teachers were always behind him on this sort of thing, a team that students could not beat, should they have the audacity to try.
There wee exceptions. Using the camera to record experiments or images was sometimes appropriate. DT Product Design was quite laid back and had us all over the school using various facilities, and we did call one another to summon people back when they were required.
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