That should be, or should not be used in the classroom in fact, it is a mistake, because in time to give the students a possession that may cause students mistake dear.
I should or should not use the phone in the classroom, in fact, it is wrong. For the time being, to keep students occupied the phone may make students do not study hard as well.
That should or should not to use the phone in the class, in fact it is wrong. Because at the time was to provide students with the phone possession that would make students not to my study as well.