A recent study has found some interesting data to bolster kids’ claims for needing their cell phones in school. Researchers at the University of Missouri found that iPhone users did better is solving a set of puzzles when they had their iPhones with them. When deprived of their iPhones, the study’s participants experienced significant physical changes — elevated heart rate, blood pressure and anxiety — alongside poorer cognitive performance. There is very little research so far on the effects of cell phone separation, but it does make an interesting case for giving in to the addiction rather than fighting it.