The Christoffersens should not be letting their daughter take the phone to school.
There's no reason in the world for a student to have a phone in school. If there's an emergency, the parents can call the front office and have the message passed on. And there's no emergency that requires the immediate notification of the child to the point of them needing to have a cell phone on their person. Children have no legal authority to make decisions, and if it's enough of an emergency that their immediate presence is required, they can be pulled from class and be waiting in the office, while the responsible adult is on their way to the school to pick them up.
“The Christoffersens should not be letting their daughter take the phone to school.”
Of course not...but it seems a lot of today’s parents cannot seem to figure this out.