In European schools, students are generally not graded by the teacher durectly, but through tests (though the teachers produce reports to parents). Thus, the op

In European schools, students are generally not graded by the teacher durectly, but through tests (though the teachers produce reports to parents). Thus, the option for the teacher to dole out an F to phone (ab)users is not available. Thankfully. Personally I think the American system whereby your grades are dictated by your teacher is quite vulnerable to all kinds of issues, but maybe I misunderstand that system.