What technology gadget do you think every high school student should have? Why?

Every school student should be able to use a phone and any music players. Why?
Well iam going to try making a point on why we should be able to use a phone, well because its really important to have and then iam tired of watching teachers on their cell. If we cant have our phone out then they shouldn't dare take their phone out no matter what. Yes they are grown and so what because they are still in school. And i said music players because sometimes music can have you going..Well it does it will keep you really focused on what you have to do.