Yes,I think students should be able to bring cell phones to school for these three reasons. First, Cell phones provide safety. If something bad happens at school and you need some sort of emergency service and the school phone is out of use or you can"t reach it use you phone to call 911 and report what's going on. Second, calculator use. If you don"t have a calculator at school and all of the ones that the school has are gone you can use your phone for a calculator so you don"t need to get on F on your test because you missed a problem.
I feel students should not take their phones because it distracts them especially teenagers with the dating theses days... And also applications and for as calculators you do not need a phone to use a calculator just get one.