Because younger children are less disciplined and perhaps not as aware of the harm they are causing themselves by playing candy crush in their maths lesson. In

Because younger children are less disciplined and perhaps not as aware of the harm they are causing themselves by playing candy crush in their maths lesson. In college you are 18+, mature enough to make your own decisions, at 11 - 17 most (not all) are unable to do this. Why do you need a phone in school anyway? Why do you need twitter or facebook or candycrush so immediately? Yes in an emergency they would be useful, but lets be honest many people survived their schooldays with a mobile phone so I am not sure why you feel that a 12year old must have a mobile phone with them at all times.