The kid was on LUNCH HOUR, he didn't receive the call during class.
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I think the article says cell phone use is prohibited during school hours. Do we know whether lunch hour is included as part of the school hours?
If the school rules stated that going to the toilet was prohibited during school hours and you were suddenly hit with a severe case of diarrhea, that you should obey the school rules merely because the time of your attack was during school hours?